diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0dc2027..f44ce56 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Changelog
 
+## [Unreleased]
+
+### Added
+
+- **Attached order (take-profit / stop-loss) support** for `SubmitOrder` and `ReplaceOrder`:
+  - New types: `AttachedOrderType` (`AttachedOrderTypeProfitTaker` / `AttachedOrderTypeStopLoss` / `AttachedOrderTypeBracket`), `AttachedOrderDetail`, `SubmitAttachedParams`, `ReplaceAttachedParams`
+  - `SubmitOrder` / `ReplaceOrder`: new `AttachedParams` field
+  - `Order` / `OrderDetail`: new `AttachedOrders []AttachedOrderDetail` field
+  - New `TradeContext.OrderDetailAttached(orderId)` and `TradeContext.CancelOrderAttached(orderId)` methods — query/cancel an attached sub-order by its own order ID
+  - `GetTodayOrders`: new `OrderId` and `IsAttached` fields — when combined, treats `OrderId` as an attached sub-order ID and returns that sub-order as an `Order` entry (not the parent order)
+
+### Breaking changes
+
+- `OrderDetail.ChargeDetail` is now `*OrderChargeDetail` (previously non-pointer). Attached orders return `nil` for this field; callers must handle the absent case.
+
 ## [v0.26.0] - 2026-07-20
 
 ### Added
diff --git a/examples/submit_order_with_attached/main.go b/examples/submit_order_with_attached/main.go
new file mode 100644
index 0000000..9e09772
--- /dev/null
+++ b/examples/submit_order_with_attached/main.go
@@ -0,0 +1,82 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/longbridge/openapi-go/config"
+	"github.com/longbridge/openapi-go/oauth"
+	"github.com/longbridge/openapi-go/trade"
+	"github.com/shopspring/decimal"
+)
+
+func main() {
+	o := oauth.New("your-client-id").
+		OnOpenURL(func(url string) { fmt.Println("Open this URL to authorize:", url) })
+	if err := o.Build(context.Background()); err != nil {
+		log.Fatal(err)
+	}
+	conf, err := config.New(config.WithOAuthClient(o))
+	if err != nil {
+		log.Fatal(err)
+	}
+	tradeContext, err := trade.NewFromCfg(conf)
+	if err != nil {
+		log.Fatal(err)
+		return
+	}
+	defer tradeContext.Close()
+	ctx := context.Background()
+
+	tradeContext.OnTrade(func(ev *trade.PushEvent) {
+		log.Printf("order event: %+v\n", ev)
+	})
+
+	// Submit a bracket order: buy 700.HK at 12.00, with a take-profit at 13.00
+	// and a stop-loss at 11.00 attached to it.
+	order := &trade.SubmitOrder{
+		Symbol:            "700.HK",
+		OrderType:         trade.OrderTypeLO,
+		Side:              trade.OrderSideBuy,
+		SubmittedQuantity: 200,
+		TimeInForce:       trade.TimeTypeDay,
+		SubmittedPrice:    decimal.NewFromFloat(12),
+		AttachedParams: &trade.SubmitAttachedParams{
+			AttachedOrderType: trade.AttachedOrderTypeBracket,
+			ProfitTakerPrice:  decimal.NewFromFloat(13),
+			StopLossPrice:     decimal.NewFromFloat(11),
+		},
+	}
+	orderId, err := tradeContext.SubmitOrder(ctx, order)
+	if err != nil {
+		log.Fatal(err)
+		return
+	}
+	fmt.Printf("orderId: %v\n", orderId)
+
+	detail, err := tradeContext.OrderDetail(ctx, orderId)
+	if err != nil {
+		log.Fatal(err)
+		return
+	}
+	for _, attached := range detail.AttachedOrders {
+		fmt.Printf("attached order: %+v\n", attached)
+
+		// The attached sub-order has its own order ID; query/cancel it directly
+		// via the *Attached variants instead of the parent order's ID.
+		attachedDetail, err := tradeContext.OrderDetailAttached(ctx, attached.OrderId)
+		if err != nil {
+			log.Fatal(err)
+			return
+		}
+		fmt.Printf("attached order detail: %+v\n", attachedDetail)
+	}
+
+	quitChannel := make(chan os.Signal, 1)
+	signal.Notify(quitChannel, syscall.SIGINT, syscall.SIGTERM)
+	<-quitChannel
+}
diff --git a/trade/context.go b/trade/context.go
index 15b5016..4954fb2 100644
--- a/trade/context.go
+++ b/trade/context.go
@@ -232,6 +232,22 @@ func (c *TradeContext) CancelOrder(ctx context.Context, orderId string) (err err
 	return
 }
 
+// CancelOrderAttached cancels an attached (take-profit / stop-loss) sub-order by its own order ID,
+// instead of the parent order's ID.
+// Reference: https://open.longbridge.com/en/docs/trade/order/withdraw
+// Example:
+//
+//	conf, err := config.NewFromEnv()
+//	tctx, err := trade.NewFromCfg(conf)
+//	err = tctx.CancelOrderAttached(context.Background(), "706388312699592705")
+func (c *TradeContext) CancelOrderAttached(ctx context.Context, orderId string) (err error) {
+	values := url.Values{}
+	values.Add("order_id", orderId)
+	values.Add("is_attached", "true")
+	err = c.opts.httpClient.Delete(ctx, "/v1/trade/order", values, nil)
+	return
+}
+
 // AccountBalance to obtain the available, desirable, frozen, to-be-settled, and in-transit funds (fund purchase and redemption) information for each currency of the user.
 // Reference: https://open.longbridge.com/en/docs/trade/asset/account
 // Example:
@@ -350,6 +366,27 @@ func (c *TradeContext) OrderDetail(ctx context.Context, orderId string) (orderDe
 	return
 }
 
+// OrderDetailAttached queries detail for an attached (take-profit / stop-loss) sub-order by its
+// own order ID, instead of the parent order's ID.
+// Reference: https://open.longbridge.com/en/docs/trade/order/order_detail
+// Example:
+//
+//	conf, err := config.NewFromEnv()
+//	tctx, err := trade.NewFromCfg(conf)
+//	od, err := tctx.OrderDetailAttached(context.Background(), "706388312699592705")
+func (c *TradeContext) OrderDetailAttached(ctx context.Context, orderId string) (orderDetail OrderDetail, err error) {
+	values := url.Values{}
+	values.Add("order_id", orderId)
+	values.Add("is_attached", "true")
+	var resp jsontypes.OrderDetail
+	err = c.opts.httpClient.Get(ctx, "/v1/trade/order", values, &resp)
+	if err != nil {
+		return
+	}
+	err = util.Copy(&orderDetail, resp)
+	return
+}
+
 // EstimateMaxPurchaseQuantity is used for estimating the maximum purchase quantity for Hong Kong and US stocks, warrants, and options.
 // Reference: https://open.longbridge.com/en/docs/trade/order/estimate_available_buy_limit
 // Example:
diff --git a/trade/jsontypes/types.go b/trade/jsontypes/types.go
index 691e5b8..e8ba19b 100644
--- a/trade/jsontypes/types.go
+++ b/trade/jsontypes/types.go
@@ -33,32 +33,58 @@ type Orders struct {
 
 // Order is order details
 type Order struct {
-	OrderId          string `json:"order_id"`
-	Status           string `json:"status"`
-	StockName        string `json:"stock_name"`
-	Quantity         string `json:"quantity"`
-	ExecutedQuantity string `json:"executed_quantity"`
-	Price            string `json:"price"`
-	ExecutedPrice    string `json:"executed_price"`
-	SubmittedAt      string `json:"submmited_at"`
-	Side             string `json:"side"`
-	Symbol           string `json:"symbol"`
-	OrderType        string `json:"order_type"`
-	LastDone         string `json:"last_done"`
-	TriggerPrice     string `json:"trigger_price"`
-	Msg              string `json:"msg"`
-	Tag              string `json:"tag"`
-	TimeInForce      string `json:"time_in_force"`
-	ExpireDate       string `json:"expire_date"`
-	UpdatedAt        string `json:"updated_at"`
-	TriggerAt        string `json:"trigger_at"`
-	TrailingAmount   string `json:"trailing_amount"`
-	TrailingPercent  string `json:"trailing_percent"`
-	LimitOffset      string `json:"limit_offset"`
-	TriggerStatus    string `json:"trigger_status"`
-	Currency         string `json:"currency"`
-	OutsideRth       string `json:"outside_rth"`
-	Remark           string `json:"remark"`
+	OrderId          string                `json:"order_id"`
+	Status           string                `json:"status"`
+	StockName        string                `json:"stock_name"`
+	Quantity         string                `json:"quantity"`
+	ExecutedQuantity string                `json:"executed_quantity"`
+	Price            string                `json:"price"`
+	ExecutedPrice    string                `json:"executed_price"`
+	SubmittedAt      string                `json:"submmited_at"`
+	Side             string                `json:"side"`
+	Symbol           string                `json:"symbol"`
+	OrderType        string                `json:"order_type"`
+	LastDone         string                `json:"last_done"`
+	TriggerPrice     string                `json:"trigger_price"`
+	Msg              string                `json:"msg"`
+	Tag              string                `json:"tag"`
+	TimeInForce      string                `json:"time_in_force"`
+	ExpireDate       string                `json:"expire_date"`
+	UpdatedAt        string                `json:"updated_at"`
+	TriggerAt        string                `json:"trigger_at"`
+	TrailingAmount   string                `json:"trailing_amount"`
+	TrailingPercent  string                `json:"trailing_percent"`
+	LimitOffset      string                `json:"limit_offset"`
+	TriggerStatus    string                `json:"trigger_status"`
+	Currency         string                `json:"currency"`
+	OutsideRth       string                `json:"outside_rth"`
+	Remark           string                `json:"remark"`
+	AttachedOrders   []AttachedOrderDetail `json:"attached_orders"`
+}
+
+// AttachedOrderDetail is the raw wire type for an attached (take-profit / stop-loss) sub-order.
+type AttachedOrderDetail struct {
+	OrderId             string `json:"order_id"`
+	AttachedTypeDisplay string `json:"attached_type_display"`
+	TriggerPrice        string `json:"trigger_price"`
+	Quantity            string `json:"quantity"`
+	ExecutedQty         string `json:"executed_qty"`
+	Status              string `json:"status"`
+	UpdatedAt           string `json:"updated_at"`
+	Withdrawn           bool   `json:"withdrawn"`
+	Gtd                 string `json:"gtd"`
+	TimeInForce         string `json:"time_in_force"`
+	CounterId           string `json:"counter_id"`
+	TriggerStatus       string `json:"trigger_status"`
+	ExecutedAmount      string `json:"executed_amount"`
+	Tag                 string `json:"tag"`
+	SubmittedAt         string `json:"submitted_at"`
+	ExecutedPrice       string `json:"executed_price"`
+	ForceOnlyRth        string `json:"force_only_rth"`
+	Reviewed            bool   `json:"reviewed"`
+	ActivateOrderType   string `json:"activate_order_type"`
+	ActivateRth         string `json:"activate_rth"`
+	SubmitPrice         string `json:"submit_price"`
 }
 
 // AccountBalances has a AccountBalance list
@@ -187,30 +213,64 @@ type PushOrderChanged struct {
 }
 
 type ReplaceOrder struct {
-	OrderId         string `json:"order_id"`
-	Quantity        uint64 `json:"quantity,string"`
-	Price           string `json:"price"`
-	TriggerPrice    string `json:"trigger_price,omitempty"`
-	LimitOffset     string `json:"limit_offset,omitempty"`
-	TrailingAmount  string `json:"trailing_ammount,omitempty"`
-	TrailingPercent string `json:"trailing_percent,omitempty"`
-	Remark          string `json:"remark"`
+	OrderId         string                 `json:"order_id"`
+	Quantity        uint64                 `json:"quantity,string"`
+	Price           string                 `json:"price"`
+	TriggerPrice    string                 `json:"trigger_price,omitempty"`
+	LimitOffset     string                 `json:"limit_offset,omitempty"`
+	TrailingAmount  string                 `json:"trailing_ammount,omitempty"`
+	TrailingPercent string                 `json:"trailing_percent,omitempty"`
+	Remark          string                 `json:"remark"`
+	AttachedParams  *ReplaceAttachedParams `json:"attached_params,omitempty"`
 }
 
 type SubmitOrder struct {
-	Symbol            string `json:"symbol"`
-	OrderType         string `json:"order_type"`
-	Side              string `json:"side"`
-	SubmittedQuantity uint64 `json:"submitted_quantity,string"`
-	SubmittedPrice    string `json:"submitted_price,omitempty"`
-	TriggerPrice      string `json:"trigger_price,omitempty"`
-	LimitOffset       string `json:"limit_offset,omitempty"`
-	TrailingAmount    string `json:"trailing_amount,omitempty"`
-	TrailingPercent   string `json:"trailing_percent,omitempty"`
-	ExpireDate        string `json:"expire_date,omitempty"`
-	OutsideRTH        string `json:"outside_rth,omitempty"`
-	Remark            string `json:"remark,omitempty"`
-	TimeInForce       string `json:"time_in_force"`
+	Symbol            string                `json:"symbol"`
+	OrderType         string                `json:"order_type"`
+	Side              string                `json:"side"`
+	SubmittedQuantity uint64                `json:"submitted_quantity,string"`
+	SubmittedPrice    string                `json:"submitted_price,omitempty"`
+	TriggerPrice      string                `json:"trigger_price,omitempty"`
+	LimitOffset       string                `json:"limit_offset,omitempty"`
+	TrailingAmount    string                `json:"trailing_amount,omitempty"`
+	TrailingPercent   string                `json:"trailing_percent,omitempty"`
+	ExpireDate        string                `json:"expire_date,omitempty"`
+	OutsideRTH        string                `json:"outside_rth,omitempty"`
+	Remark            string                `json:"remark,omitempty"`
+	TimeInForce       string                `json:"time_in_force"`
+	AttachedParams    *SubmitAttachedParams `json:"attached_params,omitempty"`
+}
+
+// SubmitAttachedParams is the raw wire type for attached order (take-profit / stop-loss) parameters on submit.
+type SubmitAttachedParams struct {
+	AttachedOrderType      string `json:"attached_order_type"`
+	ProfitTakerPrice       string `json:"profit_taker_price,omitempty"`
+	StopLossPrice          string `json:"stop_loss_price,omitempty"`
+	TimeInForce            string `json:"time_in_force,omitempty"`
+	ExpireTime             int64  `json:"expire_time,omitempty"`
+	ActivateOrderType      string `json:"activate_order_type,omitempty"`
+	ProfitTakerSubmitPrice string `json:"profit_taker_submit_price,omitempty"`
+	StopLossSubmitPrice    string `json:"stop_loss_submit_price,omitempty"`
+	ActivateRTH            string `json:"activate_rth,omitempty"`
+}
+
+// ReplaceAttachedParams is the raw wire type for attached order (take-profit / stop-loss) parameters on replace.
+type ReplaceAttachedParams struct {
+	AttachedOrderType      string `json:"attached_order_type"`
+	ProfitTakerPrice       string `json:"profit_taker_price,omitempty"`
+	StopLossPrice          string `json:"stop_loss_price,omitempty"`
+	TimeInForce            string `json:"time_in_force,omitempty"`
+	ExpireTime             int64  `json:"expire_time,omitempty"`
+	ProfitTakerId          int64  `json:"profit_taker_id,omitempty"`
+	StopLossId             int64  `json:"stop_loss_id,omitempty"`
+	CancelAllAttached      bool   `json:"cancel_all_attached,omitempty"`
+	MainId                 int64  `json:"main_id,omitempty"`
+	Quantity               string `json:"quantity,omitempty"`
+	MarketPrice            string `json:"market_price,omitempty"`
+	ActivateOrderType      string `json:"activate_order_type,omitempty"`
+	ProfitTakerSubmitPrice string `json:"profit_taker_submit_price,omitempty"`
+	StopLossSubmitPrice    string `json:"stop_loss_submit_price,omitempty"`
+	ActivateRTH            string `json:"activate_rth,omitempty"`
 }
 
 type MarginRatio struct {
@@ -252,43 +312,44 @@ type OrderHistoryDetail struct {
 
 // OrderDetail is for get order detail response
 type OrderDetail struct {
-	OrderId                  string               `json:"order_id"`
-	Status                   string               `json:"status"`
-	StockName                string               `json:"stock_name"`
-	Quantity                 string               `json:"quantity"` // Submitted quantity
-	ExecutedQuantity         string               `json:"executed_quantity"`
-	Price                    string               `json:"price"` // Submitted price
-	ExecutedPrice            string               `json:"executed_price"`
-	SubmittedAt              string               `json:"submitted_at"`
-	Side                     string               `json:"side"` // Order side
-	Symbol                   string               `json:"symbol"`
-	OrderType                string               `json:"order_type"`
-	LastDone                 string               `json:"last_done"`
-	TriggerPrice             string               `json:"trigger_price"`
-	Msg                      string               `json:"msg"` // Rejected Message or remark
-	Tag                      string               `json:"tag"`
-	TimeInForce              string               `json:"time_in_force"`
-	ExpireDate               string               `json:"expire_date"`
-	UpdatedAt                string               `json:"updated_at"`
-	TriggerAt                string               `json:"trigger_at"` // Conditional order trigger time
-	TrailingAmount           string               `json:"trailing_amount"`
-	TrailingPercent          string               `json:"trailing_precent"`
-	LimitOffset              string               `json:"limit_offset"`
-	TriggerStatus            string               `json:"trigger_status"`
-	Currency                 string               `json:"currency"`
-	OutsideRth               string               `json:"outside_rth"` // Enable or disable outside regular trading hours
-	Remark                   string               `json:"remark"`
-	FreeStatus               string               `json:"free_status"`
-	FreeAmount               string               `json:"free_amount"`
-	FreeCurrency             string               `json:"free_currency"`
-	DeductionsStatus         string               `json:"deductions_status"`
-	DeductionsAmount         string               `json:"deductions_amount"`
-	DeductionsCurrency       string               `json:"deductions_currency"`
-	PlatformDeductedStatus   string               `json:"platform_deducted_status"`
-	PlatformDeductedAmount   string               `json:"platform_deducted_amount"`
-	PlatformDeductedCurrency string               `json:"platform_deducted_currency"`
-	History                  []OrderHistoryDetail `json:"history"`
-	ChargeDetail             OrderChargeDetail    `json:"charge_detail"`
+	OrderId                  string                `json:"order_id"`
+	Status                   string                `json:"status"`
+	StockName                string                `json:"stock_name"`
+	Quantity                 string                `json:"quantity"` // Submitted quantity
+	ExecutedQuantity         string                `json:"executed_quantity"`
+	Price                    string                `json:"price"` // Submitted price
+	ExecutedPrice            string                `json:"executed_price"`
+	SubmittedAt              string                `json:"submitted_at"`
+	Side                     string                `json:"side"` // Order side
+	Symbol                   string                `json:"symbol"`
+	OrderType                string                `json:"order_type"`
+	LastDone                 string                `json:"last_done"`
+	TriggerPrice             string                `json:"trigger_price"`
+	Msg                      string                `json:"msg"` // Rejected Message or remark
+	Tag                      string                `json:"tag"`
+	TimeInForce              string                `json:"time_in_force"`
+	ExpireDate               string                `json:"expire_date"`
+	UpdatedAt                string                `json:"updated_at"`
+	TriggerAt                string                `json:"trigger_at"` // Conditional order trigger time
+	TrailingAmount           string                `json:"trailing_amount"`
+	TrailingPercent          string                `json:"trailing_precent"`
+	LimitOffset              string                `json:"limit_offset"`
+	TriggerStatus            string                `json:"trigger_status"`
+	Currency                 string                `json:"currency"`
+	OutsideRth               string                `json:"outside_rth"` // Enable or disable outside regular trading hours
+	Remark                   string                `json:"remark"`
+	FreeStatus               string                `json:"free_status"`
+	FreeAmount               string                `json:"free_amount"`
+	FreeCurrency             string                `json:"free_currency"`
+	DeductionsStatus         string                `json:"deductions_status"`
+	DeductionsAmount         string                `json:"deductions_amount"`
+	DeductionsCurrency       string                `json:"deductions_currency"`
+	PlatformDeductedStatus   string                `json:"platform_deducted_status"`
+	PlatformDeductedAmount   string                `json:"platform_deducted_amount"`
+	PlatformDeductedCurrency string                `json:"platform_deducted_currency"`
+	History                  []OrderHistoryDetail  `json:"history"`
+	ChargeDetail             *OrderChargeDetail    `json:"charge_detail"`
+	AttachedOrders           []AttachedOrderDetail `json:"attached_orders"`
 }
 
 // EstimateMaxPurchaseQuantity is response for estimate maximum purchase quantity
diff --git a/trade/params.go b/trade/params.go
index be63b4d..53aed06 100644
--- a/trade/params.go
+++ b/trade/params.go
@@ -61,6 +61,12 @@ func (p params) AddOptDecimal(key string, val decimal.Decimal) {
 	}
 }
 
+func (p params) AddOptBool(key string, val bool) {
+	if val {
+		p[key] = "true"
+	}
+}
+
 func (p params) Values() url.Values {
 	vals := url.Values{}
 	for k, v := range p {
diff --git a/trade/request_values.go b/trade/request_values.go
index 76a1a46..1aef885 100644
--- a/trade/request_values.go
+++ b/trade/request_values.go
@@ -107,6 +107,8 @@ func (r *GetTodayOrders) Values() url.Values {
 	p.Add("symbol", string(r.Symbol))
 	p.Add("side", string(r.Side))
 	p.Add("market", string(r.Market))
+	p.Add("order_id", r.OrderId)
+	p.AddOptBool("is_attached", r.IsAttached)
 	vals := p.Values()
 	for _, s := range r.Status {
 		vals.Add("status", string(s))
diff --git a/trade/requests.go b/trade/requests.go
index b9b5f33..b0f2113 100644
--- a/trade/requests.go
+++ b/trade/requests.go
@@ -36,10 +36,15 @@ type GetHistoryOrders struct {
 }
 
 type GetTodayOrders struct {
-	Symbol string         // optional
-	Status []OrderStatus  // optional
-	Side   OrderSide      // optional
-	Market openapi.Market // optional
+	Symbol  string         // optional
+	Status  []OrderStatus  // optional
+	Side    OrderSide      // optional
+	Market  openapi.Market // optional
+	OrderId string         // optional
+	// IsAttached, combined with OrderId, treats OrderId as an attached sub-order
+	// ID and returns that sub-order as an Order entry (not the parent order).
+	// Has no effect without OrderId.
+	IsAttached bool // optional
 }
 
 type GetFundPositions struct {
@@ -68,6 +73,7 @@ type ReplaceOrder struct {
 	TrailingAmount  decimal.Decimal // TSLPAMT / TSMAMT Order Required
 	TrailingPercent decimal.Decimal // TSLPPCT / TSMAPCT Order Required
 	Remark          string
+	AttachedParams  *ReplaceAttachedParams // optional, take-profit / stop-loss parameters
 }
 
 type SubmitOrder struct {
@@ -83,7 +89,44 @@ type SubmitOrder struct {
 	ExpireDate        *time.Time      // required when time_in_force is GTD
 	OutsideRTH        OutsideRTH
 	Remark            string
-	TimeInForce       TimeType // required
+	TimeInForce       TimeType              // required
+	AttachedParams    *SubmitAttachedParams // optional, take-profit / stop-loss parameters
+}
+
+// SubmitAttachedParams is attached order (take-profit / stop-loss) parameters for SubmitOrder.
+type SubmitAttachedParams struct {
+	AttachedOrderType AttachedOrderType // required
+	ProfitTakerPrice  decimal.Decimal   // optional, take-profit trigger price
+	StopLossPrice     decimal.Decimal   // optional, stop-loss trigger price
+	TimeInForce       TimeType          // optional
+	ExpireTime        int64             // optional, unix timestamp seconds, used when TimeInForce is GTD
+	ActivateOrderType OrderType         // optional, order type to submit after trigger
+	// ProfitTakerSubmitPrice is required when ActivateOrderType is LIT.
+	ProfitTakerSubmitPrice decimal.Decimal
+	// StopLossSubmitPrice is required when ActivateOrderType is LIT.
+	StopLossSubmitPrice decimal.Decimal
+	ActivateRTH         OutsideRTH // optional, RTH setting for the activated order
+}
+
+// ReplaceAttachedParams is attached order (take-profit / stop-loss) parameters for ReplaceOrder.
+type ReplaceAttachedParams struct {
+	AttachedOrderType AttachedOrderType // required
+	ProfitTakerPrice  decimal.Decimal   // optional, take-profit trigger price
+	StopLossPrice     decimal.Decimal   // optional, stop-loss trigger price
+	TimeInForce       TimeType          // optional
+	ExpireTime        int64             // optional, unix timestamp seconds, used when TimeInForce is GTD
+	ProfitTakerId     int64             // optional, existing take-profit order ID to modify
+	StopLossId        int64             // optional, existing stop-loss order ID to modify
+	CancelAllAttached bool              // optional, cancel all attached orders
+	MainId            int64             // optional, main order ID
+	Quantity          decimal.Decimal   // optional, attached order quantity
+	MarketPrice       decimal.Decimal   // optional
+	ActivateOrderType OrderType         // optional, order type to submit after trigger
+	// ProfitTakerSubmitPrice is required when ActivateOrderType is LIT.
+	ProfitTakerSubmitPrice decimal.Decimal
+	// StopLossSubmitPrice is required when ActivateOrderType is LIT.
+	StopLossSubmitPrice decimal.Decimal
+	ActivateRTH         OutsideRTH // optional, RTH setting for the activated order
 }
 
 type GetEstimateMaxPurchaseQuantity struct {
diff --git a/trade/types.go b/trade/types.go
index 6cbc265..7cae523 100644
--- a/trade/types.go
+++ b/trade/types.go
@@ -24,6 +24,7 @@ type (
 	DeductionStatus      string
 	ChargeCategoryCode   string
 	Currency             string
+	AttachedOrderType    string // Attached order type (take-profit / stop-loss / bracket)
 )
 
 const (
@@ -90,8 +91,8 @@ const (
 
 	// Order tag
 	OrderTagNormal   OrderTag = "Normal" // Normal Order
-	OrderTagLongTerm OrderTag = "Gtc"   // Long term Order
-	OrderTagGrey     OrderTag = "Grey"  // Grey Order
+	OrderTagLongTerm OrderTag = "Gtc"    // Long term Order
+	OrderTagGrey     OrderTag = "Grey"   // Grey Order
 
 	// Trigger status
 	TriggerStatusDeactive TriggerStatus = "DEACTIVE"
@@ -124,6 +125,11 @@ const (
 	CurrencyUSD     Currency = "USD"
 	CurrencyCNH     Currency = "CNH"
 	CurrencyDefault Currency = ""
+
+	// Attached order type
+	AttachedOrderTypeProfitTaker AttachedOrderType = "PROFIT_TAKER" // Take profit
+	AttachedOrderTypeStopLoss    AttachedOrderType = "STOP_LOSS"    // Stop loss
+	AttachedOrderTypeBracket     AttachedOrderType = "BRACKET"      // Bracket order (profit-taker + stop-loss)
 )
 
 // Execution is execution details
@@ -181,6 +187,32 @@ type Order struct {
 	Currency         string
 	OutsideRth       OutsideRTH
 	Remark           string
+	AttachedOrders   []AttachedOrderDetail
+}
+
+// AttachedOrderDetail is an attached (take-profit / stop-loss) sub-order of a bracket order.
+type AttachedOrderDetail struct {
+	OrderId             string
+	AttachedTypeDisplay AttachedOrderType // Actual type of this sub-order: ProfitTaker or StopLoss
+	TriggerPrice        *decimal.Decimal
+	Quantity            decimal.Decimal
+	ExecutedQty         decimal.Decimal
+	Status              OrderStatus
+	UpdatedAt           string // raw unix-second string
+	Withdrawn           bool
+	Gtd                 string // GTD expiry date, format YYYY-MM-DD
+	TimeInForce         TimeType
+	CounterId           string
+	TriggerStatus       TriggerStatus
+	ExecutedAmount      decimal.Decimal
+	Tag                 OrderTag
+	SubmittedAt         string // raw unix-second string
+	ExecutedPrice       *decimal.Decimal
+	ForceOnlyRTH        OutsideRTH
+	Reviewed            bool
+	ActivateOrderType   OrderType // Order type to submit after trigger
+	ActivateRTH         OutsideRTH
+	SubmitPrice         *decimal.Decimal // Submit (limit) price for the activated order
 }
 
 type OrderChargeItem struct {
@@ -250,7 +282,9 @@ type OrderDetail struct {
 	PlatformDeductedAmount   *decimal.Decimal
 	PlatformDeductedCurrency string
 	History                  OrderHistoryDetail
-	ChargeDetail             OrderChargeDetail
+	// ChargeDetail is nil for attached (take-profit / stop-loss) sub-orders.
+	ChargeDetail   *OrderChargeDetail
+	AttachedOrders []AttachedOrderDetail
 }
 
 // AccountBalances has a AccountBalance list