diff --git a/backend/api/v1/history.py b/backend/api/v1/history.py
index 2547c83..e3dd0e6 100644
--- a/backend/api/v1/history.py
+++ b/backend/api/v1/history.py
@@ -102,11 +102,12 @@ async def post_failure_process(
 @router.get("/inherit-batch-options", response_model=InheritBatchOptionsResponse)
 async def get_inherit_batch_options_endpoint(
     exclude_batch: Optional[str] = Query(None, description="排除的批次"),
+    q: Optional[str] = Query(None, max_length=200, description="批次子串搜索；为空时返回最近 100 个"),
     db: AsyncSession = Depends(get_db),
     payload: dict = Depends(get_current_user),
 ):
-    """获取继承弹窗的批次选项，排除当前批次，按时间倒序。"""
-    return await get_inherit_batch_options(db, exclude_batch)
+    """获取继承弹窗的批次选项，排除当前批次，按时间倒序；支持 q 全库子串搜索。"""
+    return await get_inherit_batch_options(db, exclude_batch, q)
 
 
 @router.get("/inherit-source-options", response_model=InheritSourceOptionsResponse)
diff --git a/backend/services/inherit_failure_reason_service.py b/backend/services/inherit_failure_reason_service.py
index 81dc518..d306f99 100644
--- a/backend/services/inherit_failure_reason_service.py
+++ b/backend/services/inherit_failure_reason_service.py
@@ -60,10 +60,27 @@ async def _mysql_release_lock(db: AsyncSession, lock_name: str) -> None:
     await db.execute(text("SELECT RELEASE_LOCK(:n)"), {"n": lock_name})
 
 
+_LIKE_ESCAPE_CHAR = "\\"
+_DEFAULT_BATCH_OPTIONS_LIMIT = 100
+
+
+def _like_escape_literal(value: str) -> str:
+    return (
+        value.replace(_LIKE_ESCAPE_CHAR, _LIKE_ESCAPE_CHAR + _LIKE_ESCAPE_CHAR)
+        .replace("%", _LIKE_ESCAPE_CHAR + "%")
+        .replace("_", _LIKE_ESCAPE_CHAR + "_")
+    )
+
+
 async def get_inherit_batch_options(
-    db: AsyncSession, exclude_batch: Optional[str] = None
+    db: AsyncSession,
+    exclude_batch: Optional[str] = None,
+    q: Optional[str] = None,
 ) -> InheritBatchOptionsResponse:
-    """获取继承弹窗的批次选项，排除当前批次，按时间倒序。仅返回 20 开头的批次（与历史列表默认逻辑一致）。"""
+    """获取继承弹窗的批次选项，排除当前批次，按时间倒序。仅返回 20 开头的批次。
+
+    无关键词时返回最近 100 个去重批次；有关键词时按 start_time 子串在全库检索（仍最多 100 条）。
+    """
     stmt = (
         select(ph.start_time)
         .where(ph.start_time.is_not(None))
@@ -71,10 +88,14 @@ async def get_inherit_batch_options(
         .where(ph.start_time.like("20%"))
         .distinct()
         .order_by(ph.start_time.desc())
-        .limit(100)
+        .limit(_DEFAULT_BATCH_OPTIONS_LIMIT)
     )
     if exclude_batch and str(exclude_batch).strip():
         stmt = stmt.where(ph.start_time != exclude_batch.strip())
+    q_stripped = str(q).strip() if q is not None else ""
+    if q_stripped:
+        pattern = f"%{_like_escape_literal(q_stripped)}%"
+        stmt = stmt.where(ph.start_time.like(pattern, escape=_LIKE_ESCAPE_CHAR))
     result = await db.execute(stmt)
     batches = [r[0] for r in result.all() if r[0]]
     return InheritBatchOptionsResponse(batches=batches)
diff --git a/frontend/src/pages/history/HistoryPage.tsx b/frontend/src/pages/history/HistoryPage.tsx
index 87f120c..16dad4f 100644
--- a/frontend/src/pages/history/HistoryPage.tsx
+++ b/frontend/src/pages/history/HistoryPage.tsx
@@ -315,6 +315,8 @@ export default function HistoryPage({ drilldown = false }: HistoryPageProps) {
   const [inheritSubmitLoading, setInheritSubmitLoading] = useState(false);
   /** 继承提交进行中时用于中止 HTTP，避免点取消后仍占服务端 GET_LOCK */
   const inheritAbortRef = useRef<AbortController | null>(null);
+  /** 源批次远程搜索防抖 */
+  const inheritBatchSearchTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
   const [oneClickLoading, setOneClickLoading] = useState(false);
   const [bugNotifyLoading, setBugNotifyLoading] = useState(false);
   const [reportModalVisible, setReportModalVisible] = useState(false);
@@ -955,6 +957,32 @@ export default function HistoryPage({ drilldown = false }: HistoryPageProps) {
     processForm.resetFields();
   };
 
+  const fetchInheritBatchOptions = async (q?: string, showError = false) => {
+    setInheritBatchOptionsLoading(true);
+    try {
+      const res = await historyApi.inheritBatchOptions(currentBatch, q);
+      setInheritBatchOptions(res.batches ?? []);
+    } catch (e: unknown) {
+      setInheritBatchOptions([]);
+      if (showError) {
+        const err = e as { response?: { data?: { detail?: string } }; message?: string };
+        message.error(err?.response?.data?.detail || err?.message || "获取批次选项失败");
+      }
+    } finally {
+      setInheritBatchOptionsLoading(false);
+    }
+  };
+
+  const handleInheritBatchSearch = (input: string) => {
+    if (inheritBatchSearchTimerRef.current) {
+      clearTimeout(inheritBatchSearchTimerRef.current);
+    }
+    inheritBatchSearchTimerRef.current = setTimeout(() => {
+      const trimmed = input.trim();
+      void fetchInheritBatchOptions(trimmed || undefined);
+    }, 300);
+  };
+
   const openInheritModal = async () => {
     if (!processBtnEnabled) return;
     inheritAbortRef.current?.abort();
@@ -969,16 +997,7 @@ export default function HistoryPage({ drilldown = false }: HistoryPageProps) {
       source_pfr_id: undefined,
     });
     if (showBatchDimension) {
-      setInheritBatchOptionsLoading(true);
-      try {
-        const res = await historyApi.inheritBatchOptions(currentBatch);
-        setInheritBatchOptions(res.batches ?? []);
-      } catch (e: unknown) {
-        const err = e as { response?: { data?: { detail?: string } }; message?: string };
-        message.error(err?.response?.data?.detail || err?.message || "获取批次选项失败");
-      } finally {
-        setInheritBatchOptionsLoading(false);
-      }
+      await fetchInheritBatchOptions(undefined, true);
     } else {
       setInheritSourceOptionsLoading(true);
       try {
@@ -1051,6 +1070,10 @@ export default function HistoryPage({ drilldown = false }: HistoryPageProps) {
   const handleInheritModalCancel = () => {
     inheritAbortRef.current?.abort();
     inheritAbortRef.current = null;
+    if (inheritBatchSearchTimerRef.current) {
+      clearTimeout(inheritBatchSearchTimerRef.current);
+      inheritBatchSearchTimerRef.current = null;
+    }
     setInheritSubmitLoading(false);
     setInheritModalVisible(false);
     inheritForm.resetFields();
@@ -2316,15 +2339,7 @@ export default function HistoryPage({ drilldown = false }: HistoryPageProps) {
               inheritForm.setFieldValue("source_pfr_id", undefined);
               setInheritSourceRecords([]);
               if (all.inherit_mode === "batch" && showBatchDimension) {
-                setInheritBatchOptionsLoading(true);
-                try {
-                  const res = await historyApi.inheritBatchOptions(currentBatch);
-                  setInheritBatchOptions(res.batches ?? []);
-                } catch {
-                  setInheritBatchOptions([]);
-                } finally {
-                  setInheritBatchOptionsLoading(false);
-                }
+                await fetchInheritBatchOptions();
               } else {
                 fetchInheritSourceOptions();
               }
@@ -2367,13 +2382,17 @@ export default function HistoryPage({ drilldown = false }: HistoryPageProps) {
               rules={[{ required: true, message: "请选择源批次" }]}
             >
               <Select
-                placeholder="请选择要继承的历史批次"
+                placeholder="请选择或输入批次搜索"
                 allowClear
                 showSearch
                 loading={inheritBatchOptionsLoading}
-                filterOption={(input, option) =>
-                  (option?.label ?? "").toString().toLowerCase().includes(input.toLowerCase())
-                }
+                filterOption={false}
+                onSearch={handleInheritBatchSearch}
+                onDropdownVisibleChange={(open) => {
+                  if (open && inheritBatchOptions.length === 0) {
+                    void fetchInheritBatchOptions();
+                  }
+                }}
                 options={inheritBatchOptions.map((v) => ({ label: v, value: v }))}
               />
             </Form.Item>
diff --git a/frontend/src/services/index.ts b/frontend/src/services/index.ts
index 5720d12..27295ab 100644
--- a/frontend/src/services/index.ts
+++ b/frontend/src/services/index.ts
@@ -278,9 +278,11 @@ export const historyApi = {
   failureProcess(data: FailureProcessRequest): Promise<{ success: boolean; message: string }> {
     return request.post("/history/failure-process", data) as any;
   },
-  /** 获取继承弹窗批次选项 */
-  inheritBatchOptions(excludeBatch?: string): Promise<{ batches: string[] }> {
-    const params = excludeBatch ? { exclude_batch: excludeBatch } : {};
+  /** 获取继承弹窗批次选项；q 为空返回最近 100 批，有值则按子串全库搜索 */
+  inheritBatchOptions(excludeBatch?: string, q?: string): Promise<{ batches: string[] }> {
+    const params: Record<string, string> = {};
+    if (excludeBatch) params.exclude_batch = excludeBatch;
+    if (q && q.trim()) params.q = q.trim();
     return request.get("/history/inherit-batch-options", { params }) as any;
   },
   /** 获取继承弹窗用例维度源选择三字段选项 */
diff --git a/spec/10_inherit_failure_reason_spec.md b/spec/10_inherit_failure_reason_spec.md
index 3a6af95..5c8db27 100644
--- a/spec/10_inherit_failure_reason_spec.md
+++ b/spec/10_inherit_failure_reason_spec.md
@@ -89,9 +89,10 @@
 
 | 字段 | 控件类型 | 必填 | 选项来源 | 说明 |
 |------|----------|------|----------|------|
-| 源批次 | 下拉单选 Select（可搜索） | 是 | `pipeline_history.start_time` 去重，仅 20 开头批次，排除当前批次，按时间倒序 | 选择要继承的历史轮次 |
+| 源批次 | 下拉单选 Select（可搜索，远程） | 是 | `GET /history/inherit-batch-options`：默认最近 100 个去重 `start_time`（仅 20 开头、排除当前批次、按时间倒序）；输入关键词时按子串全库检索 | 选择要继承的历史轮次 |
 
 - 当前筛选批次：勾选用例所在批次的 `start_time`（单条时即该条；多条同批次时即该批次；跨批次时无「当前批次」，不展示批次维度）
+- 默认下拉仅展示最近 100 批；在输入框输入任意批次子串后，只要库中存在即可被搜出（服务端 `q` 参数）
 
 ### 4.4 用例维度：源选择（筛选 → 选择）
 
@@ -261,7 +262,16 @@
     → 返回成功 → 前端刷新表格 → 关闭弹窗 → 成功提示
 ```
 
-## 10. 用例维度接口（补充）
+## 10. 接口补充
+
+### 10.0 批次选项接口 `GET /history/inherit-batch-options`
+
+| 参数 | 类型 | 必填 | 说明 |
+|------|------|------|------|
+| exclude_batch | string | 否 | 排除的目标批次（当前筛选批次） |
+| q | string | 否 | 批次子串；为空或不传时返回最近 100 个去重批次；有值时按 `start_time` 子串全库检索（仍最多 100 条） |
+
+约束：仅 `start_time` 以 `20` 开头的批次；按时间倒序。
 
 ### 10.1 选项接口 `GET /history/inherit-source-options`