diff --git a/backend/app/api/v1/endpoints/analytics.py b/backend/app/api/v1/endpoints/analytics.py
index 2e06f37..24a917c 100644
--- a/backend/app/api/v1/endpoints/analytics.py
+++ b/backend/app/api/v1/endpoints/analytics.py
@@ -21,6 +21,7 @@ async def capability_profile(
     spec_models: str | None = Query(None, description="规格型号，逗号分隔（可选）"),
     since: str | None = Query(None, description="起始日期 ISO"),
     until: str | None = Query(None, description="截止日期 ISO"),
+    mode: str = Query("workdays", description="耗时口径: workdays(工作小时,默认) / natural(自然小时)"),
     db: AsyncSession = Depends(get_db),
 ):
     """个人能力图谱 — X 轴=设备身份证，分组柱状图（单台设备总耗时）。"""
@@ -30,7 +31,7 @@ async def capability_profile(
     specs = [s.strip() for s in spec_models.split(",") if s.strip()] if spec_models else None
     return await get_capability_profile(
         db, assignee_ids=ids, spec_models=specs,
-        since=since_dt, until=until_dt,
+        since=since_dt, until=until_dt, mode=mode,
     )
 
 
diff --git a/backend/app/services/analytics_service.py b/backend/app/services/analytics_service.py
index 46a7832..c7e218f 100644
--- a/backend/app/services/analytics_service.py
+++ b/backend/app/services/analytics_service.py
@@ -116,10 +116,13 @@ def _to_bj(dt: datetime | None) -> datetime | None:
     return dt
 
 
-def _duration_hours(start: datetime | None, end: datetime, holidays: set = None) -> float:
-    """计算单台耗时（工作小时，排除周末/节假日），无开始时间返回 0。"""
+def _duration_hours(start: datetime | None, end: datetime, holidays: set = None, mode: str = "workdays") -> float:
+    """计算单台耗时（小时），无开始时间返回 0。
+    mode=workdays: 排除周末/节假日的工作小时；mode=natural: 自然小时。"""
     if not start:
         return 0.0
+    if mode == "natural":
+        return (end - start).total_seconds() / 3600
     from app.core.time_utils import working_duration_hours
     return working_duration_hours(start, end, holidays)
 
@@ -134,6 +137,7 @@ async def get_capability_profile(
     spec_models: list[str] | None = None,
     since: datetime | None = None,
     until: datetime | None = None,
+    mode: str = "workdays",
 ) -> CapabilityResponse:
     """
     个人能力图谱（单机颗粒度）：X 轴 = 设备身份证，每个负责人一条柱状 series。
@@ -204,7 +208,7 @@ async def get_capability_profile(
             "hours": 0.0, "prio": 9,
             "first_start": None, "last_completed": None,
         })
-        entry["hours"] += _duration_hours(start, end, holidays)
+        entry["hours"] += _duration_hours(start, end, holidays, mode)
         if start and (entry["first_start"] is None or start < entry["first_start"]):
             entry["first_start"] = start
         completed_dt = _to_bj(row[4]) if row[4] else None
diff --git a/frontend/src/pages/admin/AnalyticsDashboard.tsx b/frontend/src/pages/admin/AnalyticsDashboard.tsx
index c3c16a5..eeb0c6a 100644
--- a/frontend/src/pages/admin/AnalyticsDashboard.tsx
+++ b/frontend/src/pages/admin/AnalyticsDashboard.tsx
@@ -120,8 +120,9 @@ export default function AnalyticsDashboard() {
       q.since = range[0].startOf("day").toISOString();
       q.until = range[1].endOf("day").toISOString();
     }
+    q.mode = totalDaysMode;   // 自然天 / 工作日，控制人员视图耗时口径
     return q;
-  }, [assigneeIds, specModels, range]);
+  }, [assigneeIds, specModels, range, totalDaysMode]);
 
   const buildFlowQuery = useCallback((): FlowQuery => {
     const q: FlowQuery = {};
diff --git a/frontend/src/services/analyticsApi.ts b/frontend/src/services/analyticsApi.ts
index f4e0150..0f07b28 100644
--- a/frontend/src/services/analyticsApi.ts
+++ b/frontend/src/services/analyticsApi.ts
@@ -98,6 +98,7 @@ export interface CapabilityQuery {
   spec_models?: string[];
   since?: string;
   until?: string;
+  mode?: "natural" | "workdays";
 }
 
 export interface FlowQuery {
@@ -116,6 +117,7 @@ export async function fetchCapabilityProfile(query: CapabilityQuery): Promise<Ca
   if (query.spec_models?.length) params.spec_models = query.spec_models.join(",");
   if (query.since) params.since = query.since;
   if (query.until) params.until = query.until;
+  if (query.mode) params.mode = query.mode;
   const { data } = await api.get<CapabilityResponse>("/analytics/capability", { params });
   return data;
 }