diff --git a/backend/app/api/v1/endpoints/analytics.py b/backend/app/api/v1/endpoints/analytics.py
index 0fa50d9..2e06f37 100644
--- a/backend/app/api/v1/endpoints/analytics.py
+++ b/backend/app/api/v1/endpoints/analytics.py
@@ -38,12 +38,13 @@ async def capability_profile(
 async def flow_compare(
     product_sns: str | None = Query(None, description="身份证，逗号分隔"),
     spec_models: str | None = Query(None, description="规格型号，逗号分隔（无 product_sns 时按型号取最近设备）"),
+    mode: str = Query("natural", description="时间口径: natural(自然小时) / workdays(工作小时,排除周末节假日)"),
     db: AsyncSession = Depends(get_db),
 ):
     """设备流转对比 — 每台设备各操作人耗时（堆叠柱状，按人堆叠，识别瓶颈）。"""
     sns = [s.strip() for s in product_sns.split(",") if s.strip()] if product_sns else None
     specs = [s.strip() for s in spec_models.split(",") if s.strip()] if spec_models else None
-    return await get_flow_compare(db, product_sns=sns, spec_models=specs)
+    return await get_flow_compare(db, product_sns=sns, spec_models=specs, mode=mode)
 
 
 @router.get("/options", response_model=AnalyticsOptions)
diff --git a/backend/app/services/analytics_service.py b/backend/app/services/analytics_service.py
index a64a45e..46a7832 100644
--- a/backend/app/services/analytics_service.py
+++ b/backend/app/services/analytics_service.py
@@ -280,6 +280,7 @@ async def get_flow_compare(
     db: AsyncSession,
     product_sns: list[str] | None = None,
     spec_models: list[str] | None = None,
+    mode: str = "natural",
 ) -> FlowResponse:
     """
     查询每台设备上各操作人的任务时间区间，拼装为「生命周期时间轴」区间图：
@@ -426,10 +427,20 @@ async def get_flow_compare(
 
     # ── 按人分组，转为相对 T0 的小时偏移区间 ──
     by_assignee: dict[str, list[list]] = {}
+    # 工作日模式：把时间偏移换算为「排除周末/节假日的工作小时」，压缩休息日
+    if mode == "workdays":
+        from app.core.time_utils import working_duration_hours as _wdh
+        from app.models.holiday import Holiday as _Holiday
+        hres = await db.execute(select(_Holiday.day))
+        _holidays = {r[0] for r in hres}
     for it in intervals:
         t0 = t0_by_device[it["idx"]]
-        start_offset = round((it["start"] - t0).total_seconds() / 3600, 1)
-        end_offset = round((it["end"] - t0).total_seconds() / 3600, 1)
+        if mode == "workdays":
+            start_offset = _wdh(t0, it["start"], _holidays)
+            end_offset = _wdh(t0, it["end"], _holidays)
+        else:
+            start_offset = round((it["start"] - t0).total_seconds() / 3600, 1)
+            end_offset = round((it["end"] - t0).total_seconds() / 3600, 1)
         duration = round(end_offset - start_offset, 1)
         by_assignee.setdefault(it["assignee_id"], []).append(
             [it["idx"], start_offset, end_offset, it["task_name"], duration, it["is_main"]]
diff --git a/frontend/src/pages/admin/AnalyticsDashboard.tsx b/frontend/src/pages/admin/AnalyticsDashboard.tsx
index 08f8c39..c3c16a5 100644
--- a/frontend/src/pages/admin/AnalyticsDashboard.tsx
+++ b/frontend/src/pages/admin/AnalyticsDashboard.tsx
@@ -127,8 +127,9 @@ export default function AnalyticsDashboard() {
     const q: FlowQuery = {};
     if (productSns.length) q.product_sns = productSns;
     if (specModels.length) q.spec_models = specModels;
+    q.mode = totalDaysMode;   // 自然天 / 工作日，控制轨迹流转图时间口径
     return q;
-  }, [productSns, specModels]);
+  }, [productSns, specModels, totalDaysMode]);
 
   // ─── 能力图谱（需选择人员才发起） ──
   const loadCapability = useCallback(async () => {
diff --git a/frontend/src/services/analyticsApi.ts b/frontend/src/services/analyticsApi.ts
index ff0a30b..f4e0150 100644
--- a/frontend/src/services/analyticsApi.ts
+++ b/frontend/src/services/analyticsApi.ts
@@ -103,6 +103,7 @@ export interface CapabilityQuery {
 export interface FlowQuery {
   product_sns?: string[];
   spec_models?: string[];
+  mode?: "natural" | "workdays";
 }
 
 // ============================================================
@@ -123,6 +124,7 @@ export async function fetchFlowData(query: FlowQuery): Promise<FlowResponse> {
   const params: Record<string, string> = {};
   if (query.product_sns?.length) params.product_sns = query.product_sns.join(",");
   if (query.spec_models?.length) params.spec_models = query.spec_models.join(",");
+  if (query.mode) params.mode = query.mode;
   const { data } = await api.get<FlowResponse>("/analytics/flow", { params });
   return data;
 }