diff --git a/client/src/components/Brand.tsx b/client/src/components/Brand.tsx
index 173edc1..2253baf 100644
--- a/client/src/components/Brand.tsx
+++ b/client/src/components/Brand.tsx
@@ -14,20 +14,13 @@ export default function Brand({
   className = '',
 }: BrandProps) {
   const sizes = {
-    sm: { logo: 'w-[28px] h-auto', title: 'text-sm font-semibold' },
-    md: { logo: 'w-[36px] h-auto', title: 'text-base font-bold' },
-    lg: { logo: 'w-[44px] h-auto', title: 'text-xl font-bold tracking-tight' },
+    sm: { title: 'text-sm font-semibold' },
+    md: { title: 'text-base font-bold' },
+    lg: { title: 'text-xl font-bold tracking-tight' },
   }[size];
 
   return (
-    <div className={`inline-flex items-center gap-2.5 ${className}`}>
-      <div className="shrink-0 overflow-hidden" style={{ maxWidth: '60px' }}>
-        <img
-          src={variant === 'dark' ? '/logo-dark.svg' : '/logo-light.svg'}
-          alt="宣传部义工"
-          className={sizes.logo}
-        />
-      </div>
+    <div className={`inline-flex items-center ${className}`}>
       {showTitle && !condensed && (
         <span
           className={`${variant === 'light' ? 'text-white' : 'text-gray-900'} ${sizes.title} leading-tight whitespace-nowrap`}
diff --git a/client/src/pages/admin/Export.tsx b/client/src/pages/admin/Export.tsx
index 5feab29..c207779 100644
--- a/client/src/pages/admin/Export.tsx
+++ b/client/src/pages/admin/Export.tsx
@@ -20,6 +20,7 @@ type Opts = {
   include_hours: boolean;
   include_user_totals: boolean;
   include_user_activities: boolean;
+  include_activity_matrix: boolean;
 };
 
 const defaultOpts: Opts = {
@@ -28,6 +29,7 @@ const defaultOpts: Opts = {
   include_hours: true,
   include_user_totals: true,
   include_user_activities: false,
+  include_activity_matrix: false,
 };
 
 type Category = {
@@ -80,6 +82,14 @@ const CATEGORIES: Category[] = [
     desc: '每位部员参与过的所有活动明细（活动较多时文件较大）',
     icon: <IconEye size={28} />,
   },
+  {
+    key: 'include_activity_matrix',
+    tag: '06',
+    title: '活动时长总表（矩阵）',
+    subtitle: 'Activity Matrix',
+    desc: '行是部员（姓名+义工号），列是所有活动；多人同活动在同一列，展示每位部员的对应时长',
+    icon: <IconExport size={28} />,
+  },
 ];
 
 export default function Export() {
@@ -204,6 +214,18 @@ export default function Export() {
       });
       sheets.push({ name: '部员活动明细', data: flat });
     }
+    if (preview.activity_matrix?.activities?.length && preview.activity_matrix?.users?.length) {
+      const { activities, users } = preview.activity_matrix;
+      const data = users.map((u) => {
+        const row: any = { '部员': u.name, '义工号': u.volunteer_no || '-' };
+        for (const a of activities) {
+          row[a.title] = Number(u[String(a.id)] || 0).toFixed(2);
+        }
+        row['总时长'] = Number(u._total || 0).toFixed(2);
+        return row;
+      });
+      sheets.push({ name: '活动时长总表(矩阵)', data });
+    }
     exportToExcel(sheets, `义工数据-全部导出-${new Date().toISOString().slice(0, 10)}.xlsx`);
   };
 
@@ -350,6 +372,62 @@ export default function Export() {
               </div>
             </section>
           ) : null}
+
+          {preview.activity_matrix?.activities?.length ? (
+            <section className="card p-5">
+              <h3 className="font-semibold text-lg mb-3 border-l-4 border-primary-500 pl-3 inline-flex items-center gap-2 text-gray-800">
+                <span className="chip-primary">06</span> 活动时长总表（矩阵）
+                <span className="chip ml-2">{preview.activity_matrix.users.length} 人 × {preview.activity_matrix.activities.length} 活动</span>
+              </h3>
+              <div className="overflow-x-auto">
+                <table className="min-w-full text-sm border-collapse border border-gray-200 rounded-lg bg-white">
+                  <thead>
+                    <tr className="bg-gray-100 border-b border-gray-200">
+                      <th className="px-3 py-2.5 text-left font-semibold whitespace-nowrap border-r border-gray-200 text-gray-800 sticky left-0 bg-gray-100 z-10">部员</th>
+                      <th className="px-3 py-2.5 text-left font-semibold whitespace-nowrap border-r border-gray-200 text-gray-800 sticky left-[96px] bg-gray-100 z-10">义工号</th>
+                      {preview.activity_matrix.activities.map((a, i) => (
+                        <th
+                          key={a.id}
+                          className={`px-3 py-2.5 text-center font-semibold whitespace-nowrap text-gray-800 ${i < preview.activity_matrix!.activities!.length - 1 ? 'border-r border-gray-200' : ''}`}
+                          style={{ minWidth: 160 }}
+                          title={`${a.title}\n${String(a.start_time || '').slice(0, 16)}`}
+                        >
+                          <div className="font-semibold">{a.title}</div>
+                          <div className="mt-0.5 text-[11px] text-gray-500 font-normal">{String(a.start_time || '').slice(0, 10)}</div>
+                        </th>
+                      ))}
+                      <th className="px-3 py-2.5 text-center font-semibold whitespace-nowrap border-l border-gray-200 text-gray-800 bg-primary-50/60">总时长</th>
+                    </tr>
+                  </thead>
+                  <tbody>
+                    {preview.activity_matrix.users.map((u, ri) => (
+                      <tr key={u.id} className={`border-b border-gray-200 ${ri % 2 ? 'bg-gray-50' : 'bg-white'} hover:bg-primary-50 transition-colors`}>
+                        <td className="px-3 py-2 whitespace-nowrap border-r border-gray-200 font-medium text-gray-800 sticky left-0 z-10" style={{ background: ri % 2 ? '#f9fafb' : '#fff' }}>{u.name}</td>
+                        <td className="px-3 py-2 whitespace-nowrap border-r border-gray-200 font-mono text-xs text-gray-600 sticky left-[96px] z-10" style={{ background: ri % 2 ? '#f9fafb' : '#fff' }}>{u.volunteer_no || '-'}</td>
+                        {preview.activity_matrix!.activities!.map((a, i) => {
+                          const v = Number(u[String(a.id)] || 0);
+                          const cls = v > 0
+                            ? 'text-primary-700 font-semibold bg-primary-50/40'
+                            : 'text-gray-400';
+                          return (
+                            <td
+                              key={a.id}
+                              className={`px-3 py-2 text-center whitespace-nowrap ${cls} ${i < preview.activity_matrix!.activities!.length - 1 ? 'border-r border-gray-200/70' : ''}`}
+                            >
+                              {v > 0 ? v.toFixed(2) : '—'}
+                            </td>
+                          );
+                        })}
+                        <td className="px-3 py-2 whitespace-nowrap text-center border-l border-gray-200 font-semibold bg-primary-50/70 text-primary-700">
+                          {Number(u._total || 0).toFixed(2)} h
+                        </td>
+                      </tr>
+                    ))}
+                  </tbody>
+                </table>
+              </div>
+            </section>
+          ) : null}
         </div>
       )}
     </div>
diff --git a/client/src/types/index.ts b/client/src/types/index.ts
index db7927f..0ae1a9d 100644
--- a/client/src/types/index.ts
+++ b/client/src/types/index.ts
@@ -94,4 +94,8 @@ export interface ExportResult {
   hours?: any[];
   user_totals?: UserTotal[];
   user_activities?: UserActivities[];
+  activity_matrix?: {
+    activities: Array<{ id: number; title: string; start_time: string }>;
+    users: Array<Record<string, any>>;
+  };
 }
diff --git a/server/src/routes/export.ts b/server/src/routes/export.ts
index fadff45..c51b2d1 100644
--- a/server/src/routes/export.ts
+++ b/server/src/routes/export.ts
@@ -5,7 +5,7 @@ import { authMiddleware, AuthRequest } from '../middleware/auth';
 const router = Router();
 
 router.post('/', authMiddleware, (req: AuthRequest, res) => {
-  const { include_users, include_activities, include_hours, include_user_totals, include_user_activities } = req.body || {};
+  const { include_users, include_activities, include_hours, include_user_totals, include_user_activities, include_activity_matrix } = req.body || {};
   const db = getDb();
   const result: any = {};
 
@@ -65,6 +65,37 @@ router.post('/', authMiddleware, (req: AuthRequest, res) => {
       return { ...u, activities: acts };
     });
   }
+  if (include_activity_matrix) {
+    const activities = db.prepareCompat(`
+      SELECT id, title, start_time FROM activities ORDER BY start_time DESC, id DESC
+    `).all() as any[];
+    const users = db.prepareCompat(`
+      SELECT u.id, u.class, u.name, u.volunteer_no, g.name AS group_name
+      FROM users u LEFT JOIN work_groups g ON u.group_id = g.id
+      ORDER BY u.class, u.name
+    `).all() as any[];
+    const hoursRows = db.prepareCompat(`
+      SELECT user_id, activity_id, hours FROM hours
+    `).all() as any[];
+    const matrix: Record<string, number> = {};
+    for (const r of hoursRows) {
+      const key = `${r.user_id}|${r.activity_id}`;
+      matrix[key] = (matrix[key] || 0) + Number(r.hours || 0);
+    }
+    result.activity_matrix = {
+      activities,
+      users: users.map((u) => {
+        const row: Record<string, any> = { id: u.id, class: u.class, name: u.name, volunteer_no: u.volunteer_no, group_name: u.group_name };
+        for (const a of activities) {
+          row[String(a.id)] = Number((matrix[`${u.id}|${a.id}`] || 0).toFixed(2));
+        }
+        row._total = Number(
+          activities.reduce((s: number, a: any) => s + (Number(row[String(a.id)]) || 0), 0).toFixed(2)
+        );
+        return row;
+      }),
+    };
+  }
   res.json(result);
 });