diff --git a/client/src/pages/admin/Export.tsx b/client/src/pages/admin/Export.tsx
index 8451a49..7c2a61b 100644
--- a/client/src/pages/admin/Export.tsx
+++ b/client/src/pages/admin/Export.tsx
@@ -127,16 +127,6 @@ export default function Export() {
       return;
     }
     const sheets: Array<{ name: string; data: any[] }> = [];
-    const totalHours = (preview.hours || []).reduce((s: number, h: any) => s + Number(h.hours || 0), 0);
-    const userCount = (preview.users || []).length;
-    const activityCount = (preview.activities || []).length;
-    const hourCount = (preview.hours || []).length;
-    const avgHours = userCount > 0 ? totalHours / userCount : 0;
-    const groupDist = (preview.users || []).reduce<Record<string, number>>((m, u: any) => {
-      const key = (u.group_name || '未分组').toString();
-      key.split(/[、,，\/\s]+/).filter(Boolean).forEach((k: string) => { m[k] = (m[k] || 0) + 1; });
-      return m;
-    }, {});
     const overviewRows = (preview.hours || []).map((h: any, i: number) => ({
       '序号': i + 1,
       '班级': h.class,
@@ -150,27 +140,7 @@ export default function Export() {
       '备注': h.remark || '-',
       '登记时间': (h.created_at || '').slice(0, 16),
     }));
-    sheets.push({
-      name: '📌总合汇总',
-      data: [
-        { '指标': '部员总数', '数值': userCount, '说明': '当前在册义工' },
-        { '指标': '活动总数', '数值': activityCount, '说明': '已创建的活动' },
-        { '指标': '累计总时长', '数值': Number(totalHours).toFixed(2), '说明': '所有登记记录合计（小时）' },
-        { '指标': '登记人次', '数值': hourCount, '说明': '成功保存的时长条数' },
-        { '指标': '人均时长', '数值': Number(avgHours).toFixed(2), '说明': '累计总时长 ÷ 部员总数' },
-        { '指标': '工作组分布', '数值': Object.entries(groupDist).map(([k, v]) => `${k}:${v}人`).join('；'), '说明': '按所属工作组计数' },
-        {},
-        { '指标': '—— 明细（最细粒度，一次登记一行） ——', '数值': '', '说明': '' },
-      ].concat(overviewRows.map(r => ({
-        '指标': `L${r['序号']}`,
-        '数值': `${r['班级']} ${r['姓名']} (${r['义工号']})`,
-        '说明': `活动：${r['活动名称']}  ${r['时长(小时)']}h  ${r['备注'] !== '-' ? '｜ ' + r['备注'] : ''}  登记：${r['登记时间']}`,
-      })))
-    });
-    sheets.push({
-      name: '总合明细（平铺）',
-      data: overviewRows,
-    });
+    sheets.push({ name: '总合明细（平铺）', data: overviewRows });
     if (preview.users?.length) {
       sheets.push({
         name: '部员名册',
@@ -260,10 +230,19 @@ export default function Export() {
     }
     if (preview.activity_matrix?.activities?.length && preview.activity_matrix?.users?.length) {
       const { activities, users } = preview.activity_matrix;
+      const remarkMap: Record<string, string> = {};
+      for (const h of (preview.hours || []) as any[]) {
+        const k = `${h.user_id}_${h.activity_id}`;
+        if (h.remark) remarkMap[k] = String(h.remark);
+      }
       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);
+          const h = Number(u[String(a.id)] || 0);
+          const rmk = remarkMap[`${u.id}_${a.id}`];
+          let cell = h > 0 ? h.toFixed(2) : '—';
+          if (rmk) cell = cell + '\n备注：' + rmk;
+          row[a.title] = cell;
         }
         row['总时长'] = Number(u._total || 0).toFixed(2);
         return row;
@@ -290,16 +269,6 @@ export default function Export() {
 
   const doSummaryXlsx = () => {
     if (!preview) { alert('请先生成预览'); return; }
-    const totalHours = (preview.hours || []).reduce((s: number, h: any) => s + Number(h.hours || 0), 0);
-    const userCount = (preview.users || []).length;
-    const activityCount = (preview.activities || []).length;
-    const hourCount = (preview.hours || []).length;
-    const avgHours = userCount > 0 ? totalHours / userCount : 0;
-    const groupDist = (preview.users || []).reduce<Record<string, number>>((m, u: any) => {
-      const key = (u.group_name || '未分组').toString();
-      key.split(/[、,，\/\s]+/).filter(Boolean).forEach((k: string) => { m[k] = (m[k] || 0) + 1; });
-      return m;
-    }, {});
     const overviewRows = (preview.hours || []).map((h: any, i: number) => ({
       '序号': i + 1,
       '班级': h.class,
@@ -313,26 +282,31 @@ export default function Export() {
       '备注': h.remark || '-',
       '登记时间': (h.created_at || '').slice(0, 16),
     }));
+    const matrixSheets: any[] = [];
+    if (preview.activity_matrix?.activities?.length && preview.activity_matrix?.users?.length) {
+      const { activities, users } = preview.activity_matrix;
+      const remarkMap: Record<string, string> = {};
+      for (const h of (preview.hours || []) as any[]) {
+        const k = `${h.user_id}_${h.activity_id}`;
+        if (h.remark) remarkMap[k] = String(h.remark);
+      }
+      const data = users.map((u) => {
+        const row: any = { '部员': u.name, '义工号': u.volunteer_no || '-' };
+        for (const a of activities) {
+          const h = Number(u[String(a.id)] || 0);
+          const rmk = remarkMap[`${u.id}_${a.id}`];
+          let cell = h > 0 ? h.toFixed(2) : '—';
+          if (rmk) cell = cell + '\n备注：' + rmk;
+          row[a.title] = cell;
+        }
+        row['总时长'] = Number(u._total || 0).toFixed(2);
+        return row;
+      });
+      matrixSheets.push({ name: '活动时长总表(矩阵+备注)', data });
+    }
     exportToExcel([
-      {
-        name: '📌数据总览',
-        data: [
-          { '宣传部义工时长记录系统 · 数据总览 KPI': '', '': '', '  生成时间': utc8DateTimeStamp() },
-          {},
-          { '指标': '部员总数', '数值': userCount, '说明': '在册义工（含未参与活动）' },
-          { '指标': '活动总数', '数值': activityCount, '说明': '活动管理页创建过的活动数' },
-          { '指标': '累计总时长', '数值': Number(totalHours).toFixed(2), '说明': '所有登记记录累加（小时）' },
-          { '指标': '登记人次', '数值': hourCount, '说明': '成功保存的时长登记条数' },
-          { '指标': '人均时长', '数值': Number(avgHours).toFixed(2), '说明': '累计 ÷ 部员总数' },
-          { '指标': '工作组分布', '数值': Object.entries(groupDist).map(([k, v]) => `${k}：${v} 人`).join('；') || '—', '说明': '按所属工作组计数（一部员多组则分别计 1）' },
-          {},
-          { '指标': '工作组分排行（Top）', '数值': '', '说明': '' },
-          ...Object.entries(groupDist)
-            .sort((x, y) => y[1] - x[1])
-            .map(([k, v], i) => ({ '指标': `T${i + 1} ${k}`, '数值': `${v} 人`, '说明': `占部员 ${userCount > 0 ? ((v / userCount) * 100).toFixed(1) : '0.0'}%` })),
-        ]
-      },
       { name: '总合明细（平铺 · 全部字段）', data: overviewRows },
+      ...matrixSheets,
       ...(preview.users?.length ? [{
         name: '部员名册',
         data: preview.users.map((u: any, i: number) => ({
@@ -458,23 +432,7 @@ export default function Export() {
             <div className="muted mt-1.5">义工数据汇总导出 | 生成时间：{utc8DateTimeStamp()}</div>
           </div>
 
-          {kpis.length > 0 && (
-            <section className="animate-fade-in-up">
-              <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">00</span> 关键数据总览（KPI）
-              </h3>
-              <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-5 gap-2.5 md:gap-3.5">
-                {kpis.map((k, i) => (
-                  <div key={i} className={`relative overflow-hidden rounded-lg border bg-gradient-to-br ${toneBg[k.tone]} p-3 md:p-4 shadow-sm`}>
-                    <div className="text-[12px] md:text-xs font-semibold opacity-80 leading-tight">{k.label}</div>
-                    <div className={`mt-2 text-xl md:text-2xl font-bold tracking-tight leading-none ${toneText[k.tone]}`}>{k.value}</div>
-                    {k.hint ? <div className="mt-2 text-[11px] md:text-[12px] opacity-70 leading-tight">{k.hint}</div> : null}
-                  </div>
-                ))}
-              </div>
-            </section>
-          )}
-
+          {kpis.length > 0 && null}
           {preview.hours?.length ? (
             <section className="animate-fade-in-up">
               <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">
@@ -572,44 +530,67 @@ export default function Export() {
                     <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>
-                      ))}
+                      {preview.activity_matrix.activities.map((a, i) => {
+                        const lastAct = i < preview.activity_matrix!.activities!.length - 1;
+                        return (
+                          <th
+                            key={a.id}
+                            className={`px-3 py-2.5 text-center font-semibold whitespace-nowrap text-gray-800 ${lastAct ? 'border-r border-gray-200' : ''}`}
+                            style={{ minWidth: 180 }}
+                            title={`${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">时长 / 备注</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} ${i < preview.activity_matrix!.activities!.length - 1 ? 'border-r border-gray-200/70' : ''}`}
-                            >
-                              {v > 0 ? v.toFixed(2) : '—'}
+                    {(() => {
+                      const rem: Record<string, string> = {};
+                      for (const h of (preview.hours || []) as any[]) {
+                        if (h.remark) rem[`${h.user_id}_${h.activity_id}`] = String(h.remark);
+                      }
+                      return preview.activity_matrix.users.map((u, ri) => {
+                        const bg = ri % 2 ? '#f9fafb' : '#fff';
+                        return (
+                          <tr key={u.id} className={`border-b border-gray-200 ${ri % 2 ? 'bg-gray-50' : 'bg-white'} hover:bg-primary-50 transition-colors`}>
+                            <td className="px-3 py-2 whitespace-nowrap border-r border-gray-200 font-medium text-gray-800 sticky left-0 z-10" style={{ background: bg }}>{u.name}</td>
+                            <td className="px-3 py-2 whitespace-nowrap border-r border-gray-200 font-mono text-xs text-gray-600 sticky left-[96px] z-10" style={{ background: bg }}>{u.volunteer_no || '-'}</td>
+                            {preview.activity_matrix!.activities!.map((a, i) => {
+                              const lastAct = i < preview.activity_matrix!.activities!.length - 1;
+                              const v = Number(u[String(a.id)] || 0);
+                              const r = rem[`${u.id}_${a.id}`];
+                              const cls = v > 0
+                                ? 'text-primary-700 font-semibold bg-primary-50/40'
+                                : 'text-gray-400';
+                              return (
+                                <td
+                                  key={a.id}
+                                  className={`px-2 py-2 whitespace-normal text-xs leading-snug text-center align-top ${cls} ${lastAct ? 'border-r border-gray-200/70' : ''}`}
+                                  style={{ minWidth: 180, verticalAlign: 'top' }}
+                                >
+                                  <div className={`text-sm font-semibold ${v > 0 ? 'text-primary-700' : 'text-gray-400'}`}>
+                                    {v > 0 ? v.toFixed(2) : '—'}
+                                  </div>
+                                  {r ? (
+                                    <div className="mt-1 text-[11px] font-normal text-gray-500 text-left bg-white/70 rounded border border-gray-100 px-1.5 py-1 leading-snug break-all" title={r}>
+                                      {r}
+                                    </div>
+                                  ) : null}
+                                </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)}
                             </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)}
-                        </td>
-                      </tr>
-                    ))}
+                          </tr>
+                        );
+                      });
+                    })()}
                   </tbody>
                 </table>
               </div>