diff --git a/docs/components/segmented.md b/docs/components/segmented.md
index 0f412fa..814328a 100644
--- a/docs/components/segmented.md
+++ b/docs/components/segmented.md
@@ -19,11 +19,24 @@
 }
 `" />
 
+## 键盘操作
+
+组件按单选组语义暴露给辅助技术。聚焦选项后，可使用方向键切换选项，`Home` 跳到第一个可用选项，`End` 跳到最后一个可用选项。
+
 ## API
 
-| 属性 | 说明 | 类型 | 默认值 |
-| --- | --- | --- | --- |
-| options | 选项列表 | `SegmentedOption[]` | - |
-| value | 当前值 | `string` | - |
-| defaultValue | 默认值 | `string` | - |
-| onChange | 变化回调 | `(value: string) => void` | - |
+| 属性         | 说明               | 类型                      | 默认值  |
+| ------------ | ------------------ | ------------------------- | ------- |
+| options      | 选项列表           | `SegmentedOption[]`       | -       |
+| value        | 当前值             | `string`                  | -       |
+| defaultValue | 默认值             | `string`                  | -       |
+| disabled     | 禁用整个分段控制器 | `boolean`                 | `false` |
+| onChange     | 变化回调           | `(value: string) => void` | -       |
+
+## SegmentedOption
+
+| 属性     | 说明     | 类型        | 默认值  |
+| -------- | -------- | ----------- | ------- |
+| label    | 选项内容 | `ReactNode` | -       |
+| value    | 选项值   | `string`    | -       |
+| disabled | 禁用选项 | `boolean`   | `false` |
diff --git a/packages/ui/src/components/form/controls/Segmented/Segmented.test.tsx b/packages/ui/src/components/form/controls/Segmented/Segmented.test.tsx
new file mode 100644
index 0000000..ea88dee
--- /dev/null
+++ b/packages/ui/src/components/form/controls/Segmented/Segmented.test.tsx
@@ -0,0 +1,79 @@
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { describe, expect, it, vi } from 'vitest'
+
+import { Segmented } from './Segmented'
+
+const options = [
+  { label: 'Day', value: 'day' },
+  { label: 'Week', value: 'week', disabled: true },
+  { label: 'Month', value: 'month' },
+]
+
+describe('Segmented', () => {
+  it('exposes radiogroup semantics for the selected option', () => {
+    render(<Segmented aria-label="View range" options={options} defaultValue="day" />)
+
+    expect(screen.getByRole('radiogroup', { name: 'View range' })).toBeInTheDocument()
+    expect(screen.getByRole('radio', { name: 'Day' })).toHaveAttribute('aria-checked', 'true')
+    expect(screen.getByRole('radio', { name: 'Month' })).toHaveAttribute('aria-checked', 'false')
+  })
+
+  it('calls onChange when an option is selected', async () => {
+    const user = userEvent.setup()
+    const onChange = vi.fn()
+
+    render(<Segmented options={options} defaultValue="day" onChange={onChange} />)
+
+    await user.click(screen.getByRole('radio', { name: 'Month' }))
+
+    expect(onChange).toHaveBeenCalledWith('month')
+    expect(screen.getByRole('radio', { name: 'Month' })).toHaveAttribute('aria-checked', 'true')
+  })
+
+  it('defaults to the first enabled option', () => {
+    render(<Segmented options={options} />)
+
+    expect(screen.getByRole('radio', { name: 'Day' })).toHaveAttribute('aria-checked', 'true')
+
+    render(<Segmented options={[{ label: 'Off', value: 'off', disabled: true }, ...options]} />)
+
+    expect(screen.getAllByRole('radio', { name: 'Day' })[1]).toHaveAttribute('aria-checked', 'true')
+  })
+
+  it('supports arrow, home, and end keyboard navigation while skipping disabled options', async () => {
+    const user = userEvent.setup()
+    const onChange = vi.fn()
+
+    render(<Segmented options={options} defaultValue="day" onChange={onChange} />)
+
+    const day = screen.getByRole('radio', { name: 'Day' })
+    day.focus()
+
+    await user.keyboard('{ArrowRight}')
+    expect(onChange).toHaveBeenLastCalledWith('month')
+    expect(screen.getByRole('radio', { name: 'Month' })).toHaveFocus()
+
+    await user.keyboard('{ArrowRight}')
+    expect(onChange).toHaveBeenLastCalledWith('day')
+    expect(day).toHaveFocus()
+
+    await user.keyboard('{End}')
+    expect(onChange).toHaveBeenLastCalledWith('month')
+
+    await user.keyboard('{Home}')
+    expect(onChange).toHaveBeenLastCalledWith('day')
+  })
+
+  it('does not update when disabled', async () => {
+    const user = userEvent.setup()
+    const onChange = vi.fn()
+
+    render(<Segmented options={options} defaultValue="day" disabled onChange={onChange} />)
+
+    await user.click(screen.getByRole('radio', { name: 'Month' }))
+
+    expect(onChange).not.toHaveBeenCalled()
+    expect(screen.getByRole('radiogroup')).toHaveAttribute('aria-disabled', 'true')
+  })
+})
diff --git a/packages/ui/src/components/form/controls/Segmented/Segmented.tsx b/packages/ui/src/components/form/controls/Segmented/Segmented.tsx
index f164319..9d16ccc 100644
--- a/packages/ui/src/components/form/controls/Segmented/Segmented.tsx
+++ b/packages/ui/src/components/form/controls/Segmented/Segmented.tsx
@@ -1,4 +1,4 @@
-import { forwardRef, type HTMLAttributes, type ReactNode } from 'react'
+import { forwardRef, useRef, type HTMLAttributes, type KeyboardEvent, type ReactNode } from 'react'
 import { cn } from '../../../../utils/cn'
 import { useControllableState } from '../../../../utils/useControllableState'
 
@@ -12,6 +12,7 @@ export interface SegmentedProps extends Omit<HTMLAttributes<HTMLDivElement>, 'on
   options: SegmentedOption[]
   value?: string
   defaultValue?: string
+  disabled?: boolean
   onChange?: (value: string) => void
 }
 
@@ -20,31 +21,126 @@ export const Segmented = forwardRef<HTMLDivElement, SegmentedProps>(function Seg
     className,
     options,
     value,
-    defaultValue = options[0]?.value ?? '',
+    defaultValue = options.find((item) => !item.disabled)?.value ?? options[0]?.value ?? '',
+    disabled,
     onChange,
+    'aria-label': ariaLabel = 'Segmented options',
     ...props
   },
   ref,
 ) {
+  const buttonRefs = useRef<Array<HTMLButtonElement | null>>([])
   const [current, setCurrent] = useControllableState<string>({
     value,
     defaultValue,
     onChange,
   })
 
+  const enabledOptions = options.filter((item) => !item.disabled)
+  const tabbableValue = enabledOptions.some((item) => item.value === current)
+    ? current
+    : (enabledOptions[0]?.value ?? '')
+
+  const selectValue = (nextValue: string, shouldFocus = true) => {
+    if (disabled) {
+      return
+    }
+
+    const nextOption = options.find((item) => item.value === nextValue)
+    if (!nextOption || nextOption.disabled) {
+      return
+    }
+
+    setCurrent(nextValue)
+
+    if (shouldFocus) {
+      const nextIndex = options.findIndex((item) => item.value === nextValue)
+      buttonRefs.current[nextIndex]?.focus()
+    }
+  }
+
+  const selectRelative = (step: number) => {
+    if (enabledOptions.length === 0) {
+      return
+    }
+
+    const currentIndex = enabledOptions.findIndex((item) => item.value === current)
+    const baseIndex = currentIndex >= 0 ? currentIndex : 0
+    const nextIndex = (baseIndex + step + enabledOptions.length) % enabledOptions.length
+
+    selectValue(enabledOptions[nextIndex].value)
+  }
+
+  const handleKeyDown = (event: KeyboardEvent<HTMLButtonElement>) => {
+    if (disabled) {
+      return
+    }
+
+    if (['ArrowRight', 'ArrowDown'].includes(event.key)) {
+      event.preventDefault()
+      selectRelative(1)
+      return
+    }
+
+    if (['ArrowLeft', 'ArrowUp'].includes(event.key)) {
+      event.preventDefault()
+      selectRelative(-1)
+      return
+    }
+
+    if (event.key === 'Home') {
+      event.preventDefault()
+      selectValue(enabledOptions[0]?.value ?? '')
+      return
+    }
+
+    if (event.key === 'End') {
+      event.preventDefault()
+      selectValue(enabledOptions[enabledOptions.length - 1]?.value ?? '')
+    }
+  }
+
   return (
-    <div ref={ref} className={cn('inline-flex rounded-lg border border-slate-200 bg-white p-1 dark:border-slate-700 dark:bg-slate-900', className)} {...props}>
-      {options.map((item) => (
-        <button
-          key={item.value}
-          type="button"
-          disabled={item.disabled}
-          onClick={() => setCurrent(item.value)}
-          className={cn('rounded-md px-3 py-1.5 text-sm transition', current === item.value ? 'bg-brand-500 text-white' : 'text-slate-700 hover:bg-slate-100 dark:text-slate-200 dark:hover:bg-slate-800', item.disabled && 'opacity-50')}
-        >
-          {item.label}
-        </button>
-      ))}
+    <div
+      ref={ref}
+      role="radiogroup"
+      aria-label={ariaLabel}
+      aria-disabled={disabled || undefined}
+      className={cn(
+        'inline-flex rounded-lg border border-slate-200 bg-white p-1 dark:border-slate-700 dark:bg-slate-900',
+        disabled && 'opacity-60',
+        className,
+      )}
+      {...props}
+    >
+      {options.map((item, index) => {
+        const selected = current === item.value
+        const itemDisabled = disabled || item.disabled
+        return (
+          <button
+            key={item.value}
+            ref={(node) => {
+              buttonRefs.current[index] = node
+            }}
+            type="button"
+            role="radio"
+            aria-checked={selected}
+            disabled={itemDisabled}
+            tabIndex={itemDisabled ? -1 : item.value === tabbableValue ? 0 : -1}
+            onClick={() => selectValue(item.value, false)}
+            onKeyDown={handleKeyDown}
+            className={cn(
+              'rounded-md px-3 py-1.5 text-sm transition focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-brand-500',
+              selected
+                ? 'bg-brand-500 text-white'
+                : 'text-slate-700 hover:bg-slate-100 dark:text-slate-200 dark:hover:bg-slate-800',
+              itemDisabled && 'opacity-50',
+            )}
+          >
+            {item.label}
+          </button>
+        )
+      })}
     </div>
   )
 })