diff --git a/client/src/pages/admin/Users.tsx b/client/src/pages/admin/Users.tsx
index 025e2d9..f0b2ea5 100644
--- a/client/src/pages/admin/Users.tsx
+++ b/client/src/pages/admin/Users.tsx
@@ -749,49 +749,61 @@ export default function Users() {
               <h3 className="font-semibold mb-2 text-gray-800">
                 参与的活动（{detail.activities.length} 次）<span className="ml-2 text-xs font-normal muted">按登记时间倒序，最新补录/登记在最上方</span>
               </h3>
-              <DataTable
-                columns={[
-                  {
-                    key: 'title',
-                    title: '活动名称',
-                    width: '30%',
-                    render: (r: any) => (
-                      <div className="font-medium leading-snug break-words max-w-[280px]">{r.title}</div>
-                    ),
-                  },
-                  {
-                    key: 'time',
-                    title: '活动时间',
-                    width: '240px',
-                    render: (r: any) => (
-                      <div className="text-xs font-mono tracking-wide leading-snug whitespace-nowrap pl-3 pr-2 text-gray-700 text-left">
-                        {formatDateRange(r.start_time, r.end_time)}
-                      </div>
-                    ),
-                  },
-                  {
-                    key: 'hours',
-                    title: '时长',
-                    width: '100px',
-                    render: (r: any) => (
-                      <span className="font-semibold text-primary-600 text-center block w-full text-sm">
-                        {Number(r.hours || 0).toFixed(1)}h
-                      </span>
-                    ),
-                  },
-                  {
-                    key: 'remark',
-                    title: '备注',
-                    render: (r: any) => (
-                      <div className="leading-relaxed break-words text-gray-700 pr-2">
-                        {r.remark || <span className="muted">—</span>}
-                      </div>
-                    ),
-                  },
-                ]}
-                data={detail.activities}
-                rowKey={(r: any) => `${r.id}-${r.reg_at || r.hours}-${r.remark || ''}`}
-              />
+              <div className="overflow-hidden">
+                <DataTable
+                  columns={[
+                    {
+                      key: 'title',
+                      title: '活动名称',
+                      width: '30%',
+                      render: (r: any) => (
+                        <div className="font-medium leading-snug break-words max-w-[280px]">{r.title}</div>
+                      ),
+                    },
+                    {
+                      key: 'time',
+                      title: '活动时间',
+                      width: '240px',
+                      render: (r: any) => (
+                        <div className="text-xs font-mono tracking-wide leading-snug whitespace-nowrap pl-3 pr-2 text-gray-700 text-left">
+                          {formatDateRange(r.start_time, r.end_time)}
+                        </div>
+                      ),
+                    },
+                    {
+                      key: 'hours',
+                      title: '时长',
+                      width: '100px',
+                      render: (r: any) => (
+                        <span className="font-semibold text-primary-600 text-center block w-full text-sm">
+                          {Number(r.hours || 0).toFixed(1)}h
+                        </span>
+                      ),
+                    },
+                    {
+                      key: 'remark',
+                      title: '备注',
+                      render: (r: any) => (
+                        <div className="leading-relaxed break-words text-gray-700 pr-2">
+                          {r.remark || <span className="muted">—</span>}
+                        </div>
+                      ),
+                    },
+                  ]}
+                  data={detail.activities}
+                  rowKey={(r: any) => `${r.id}-${r.reg_at || r.hours}-${r.remark || ''}`}
+                />
+                {detail.activities.length > 0 && (
+                  <div className="mt-1 px-3 py-2.5 rounded-b-md border-t border-gray-200 bg-primary-50/60 flex items-center justify-between">
+                    <div className="text-sm font-medium text-gray-700">
+                      本页列表合计 <span className="text-gray-500 text-xs ml-1">（应等于上方卡片的累计时长）</span>
+                    </div>
+                    <div className="text-lg font-bold text-primary-700">
+                      {detail.activities.reduce((s: number, r: any) => s + Number(r.hours || 0), 0).toFixed(1)}h
+                    </div>
+                  </div>
+                )}
+              </div>
             </div>
           </div>
         )}
diff --git a/server/src/routes/users.ts b/server/src/routes/users.ts
index 551fc1b..be319ca 100644
--- a/server/src/routes/users.ts
+++ b/server/src/routes/users.ts
@@ -82,6 +82,8 @@ router.get('/:id', (req: Request, res: Response) => {
     WHERE h.user_id = ?
     ORDER BY h.created_at DESC, a.start_time DESC
   `).all(id);
+  const listSum = activities.reduce((s, r) => s + Number(r.hours || 0), 0);
+  user.total_hours = Number(listSum.toFixed(1));
   res.json({ ...user, activities });
 });