diff --git a/client/src/pages/admin/Users.tsx b/client/src/pages/admin/Users.tsx
index d0b9d3d..025e2d9 100644
--- a/client/src/pages/admin/Users.tsx
+++ b/client/src/pages/admin/Users.tsx
@@ -747,23 +747,50 @@ export default function Users() {
             </div>
             <div>
               <h3 className="font-semibold mb-2 text-gray-800">
-                参与的活动（{detail.activities.length} 次）
+                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', render: (r: any) => <span className="font-medium">{r.title}</span> },
-                  { key: 'time', title: '时间', render: (r: any) => formatDateRange(r.start_time, r.end_time) },
+                  {
+                    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">{Number(r.hours || 0).toFixed(1)}h</span>
+                      <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>
                     ),
                   },
-                  { key: 'remark', title: '备注', render: (r: any) => r.remark || '—' },
                 ]}
                 data={detail.activities}
-                rowKey={(r: any) => r.id}
+                rowKey={(r: any) => `${r.id}-${r.reg_at || r.hours}-${r.remark || ''}`}
               />
             </div>
           </div>
diff --git a/client/src/utils/export.ts b/client/src/utils/export.ts
index 72db3cb..b7e6dc9 100644
--- a/client/src/utils/export.ts
+++ b/client/src/utils/export.ts
@@ -271,9 +271,12 @@ export async function exportTableToImage(el: HTMLElement, filename: string) {
 }
 
 export function formatDateRange(s: string, e: string) {
-  const a = s?.replace('T', ' ')?.slice(0, 16);
-  const b = e?.replace('T', ' ')?.slice(0, 16);
-  return `${a || ''} ~ ${b || ''}`;
+  const a = s?.replace('T', ' ')?.slice(0, 16) || '';
+  const b = e?.replace('T', ' ')?.slice(0, 16) || '';
+  if (a && b && a.slice(0, 10) === b.slice(0, 10)) {
+    return `${a} ~ ${b.slice(11)}`;
+  }
+  return `${a} ~ ${b}`;
 }
 
 export function formatCnDateTime(s?: string | null, withSeconds = false): string {
diff --git a/server/src/routes/users.ts b/server/src/routes/users.ts
index 14aa43b..551fc1b 100644
--- a/server/src/routes/users.ts
+++ b/server/src/routes/users.ts
@@ -76,11 +76,11 @@ router.get('/:id', (req: Request, res: Response) => {
   if (!raw) return res.status(404).json({ error: '部员不存在' });
   const user = enrichUser(raw);
   const activities = db.prepareCompat(`
-    SELECT a.id, a.title, a.start_time, a.end_time, h.hours, h.remark
+    SELECT a.id, a.title, a.start_time, a.end_time, h.hours, h.remark, h.created_at AS reg_at
     FROM hours h
     JOIN activities a ON h.activity_id = a.id
     WHERE h.user_id = ?
-    ORDER BY a.start_time DESC
+    ORDER BY h.created_at DESC, a.start_time DESC
   `).all(id);
   res.json({ ...user, activities });
 });