diff --git a/client/src/api/index.ts b/client/src/api/index.ts
index 2b570cb..02efee7 100644
--- a/client/src/api/index.ts
+++ b/client/src/api/index.ts
@@ -82,6 +82,14 @@ export const hoursApi = {
   batch: (activity_id: number, items: Array<{ user_id: number; hours: number; remark: string }>) =>
     api.post('/hours/batch', { activity_id, items }).then(r => r.data),
   byActivity: (id: number) => api.get<HoursActivityResult>(`/hours/activity/${id}`).then(r => r.data),
+  directAdd: (items: Array<{ user_id: number; hours: number; reason: string }>) =>
+    api.post<{
+      ok: boolean;
+      added: number;
+      total_hours: number;
+      results: Array<{ user_id: number; class: string; name: string; volunteer_no: string | null; hours: number; reason: string }>;
+      direct_add_activity_id: number;
+    }>('/hours/direct-add', { items }).then(r => r.data),
 };
 
 export const exportApi = {
diff --git a/client/src/pages/admin/Users.tsx b/client/src/pages/admin/Users.tsx
index fb65350..d0b9d3d 100644
--- a/client/src/pages/admin/Users.tsx
+++ b/client/src/pages/admin/Users.tsx
@@ -4,7 +4,7 @@ import Input from '../../components/Input';
 import DataTable from '../../components/DataTable';
 import Modal from '../../components/Modal';
 import Textarea from '../../components/Textarea';
-import { groupsApi, usersApi, errMsg } from '../../api';
+import { groupsApi, usersApi, hoursApi, errMsg } from '../../api';
 import { formatDateRange } from '../../utils/export';
 import type { UserItem, UserDetail, WorkGroup } from '../../types';
 import { IconUsers, IconPlus, IconEdit, IconTrash, IconEye } from '../../components/Icons';
@@ -105,6 +105,13 @@ export default function Users() {
 
   const [selectedIds, setSelectedIds] = useState<Set<number>>(new Set());
 
+  const [directOpen, setDirectOpen] = useState(false);
+  const [directUserIds, setDirectUserIds] = useState<number[]>([]);
+  const [directHours, setDirectHours] = useState('');
+  const [directReason, setDirectReason] = useState('');
+  const [directError, setDirectError] = useState('');
+  const [directSubmitting, setDirectSubmitting] = useState(false);
+
   const load = async () => {
     setLoading(true);
     try {
@@ -208,6 +215,62 @@ export default function Users() {
     }
   };
 
+  const openBatchDirectAdd = () => {
+    if (selectedCount === 0) return;
+    setDirectUserIds(Array.from(selectedIds));
+    setDirectHours('');
+    setDirectReason('');
+    setDirectError('');
+    setDirectOpen(true);
+  };
+  const openSingleDirectAdd = (u: { id: number }) => {
+    setDirectUserIds([u.id]);
+    setDirectHours('');
+    setDirectReason('');
+    setDirectError('');
+    setDirectOpen(true);
+  };
+  const refreshDetailAfterDirect = async () => {
+    if (!detailOpen || !detail) return;
+    try {
+      const d = await usersApi.detail(detail.id);
+      setDetail({ ...d, group_ids: d.group_ids ?? [], group_names: d.group_names ?? [] });
+    } catch {}
+  };
+  const submitDirectAdd = async () => {
+    setDirectError('');
+    const h = Number(directHours);
+    const reason = directReason.trim();
+    if (!Number.isFinite(h) || h <= 0) {
+      setDirectError('时长必须是大于 0 的数字');
+      return;
+    }
+    if (!reason) {
+      setDirectError('必须填写原因（将作为备注保存）');
+      return;
+    }
+    if (directUserIds.length === 0) {
+      setDirectError('请先选择部员');
+      return;
+    }
+    setDirectSubmitting(true);
+    try {
+      const items = directUserIds.map((id) => ({ user_id: id, hours: h, reason }));
+      const result = await hoursApi.directAdd(items);
+      const names = result.results.slice(0, 5).map((r) => `${r.class}${r.name}`).join('、');
+      const more = result.results.length > 5 ? ` 等 ${result.results.length} 人` : '';
+      alert(`补录完成：已为 ${names}${more} 累计加 ${Number(result.total_hours).toFixed(1)} 小时`);
+      setDirectOpen(false);
+      clearSelection();
+      await load();
+      await refreshDetailAfterDirect();
+    } catch (e) {
+      setDirectError(errMsg(e, '补录义工时失败'));
+    } finally {
+      setDirectSubmitting(false);
+    }
+  };
+
   const submit = async () => {
     if (!form.class.trim() || !form.name.trim()) {
       setError('班级与姓名不能为空');
@@ -402,11 +465,18 @@ export default function Users() {
         />
         <div className="flex gap-2 flex-wrap">
           {selectedCount > 0 && (
-            <Button variant="danger" onClick={batchDelete}>
-              <span className="inline-flex items-center gap-2">
-                <IconTrash size={18} />删除选中（{selectedCount}）
-              </span>
-            </Button>
+            <>
+              <Button onClick={openBatchDirectAdd}>
+                <span className="inline-flex items-center gap-2">
+                  <IconPlus size={18} />批量加义工时（{selectedCount}）
+                </span>
+              </Button>
+              <Button variant="danger" onClick={batchDelete}>
+                <span className="inline-flex items-center gap-2">
+                  <IconTrash size={18} />删除选中（{selectedCount}）
+                </span>
+              </Button>
+            </>
           )}
           <Button variant="secondary" onClick={() => setBatchOpen(true)}>
             <span className="inline-flex items-center gap-2">
@@ -657,11 +727,18 @@ export default function Users() {
                 <div className="muted mb-1">义工号</div>
                 <div className="font-semibold text-gray-800">{detail.volunteer_no || '—'}</div>
               </div>
-              <div className="card p-3 bg-primary-50/60">
-                <div className="muted mb-1">累计时长</div>
-                <div className="font-semibold text-lg text-primary-600">
-                  {Number(detail.total_hours || 0).toFixed(1)}h
+              <div className="card p-3 bg-primary-50/60 flex flex-col justify-between gap-2">
+                <div>
+                  <div className="muted mb-1">累计时长</div>
+                  <div className="font-semibold text-lg text-primary-600">
+                    {Number(detail.total_hours || 0).toFixed(1)}h
+                  </div>
                 </div>
+                <Button size="sm" onClick={() => openSingleDirectAdd(detail)} className="justify-center">
+                  <span className="inline-flex items-center gap-1">
+                    <IconPlus size={14} />加义工时
+                  </span>
+                </Button>
               </div>
             </div>
             <div className="card p-3">
@@ -692,6 +769,86 @@ export default function Users() {
           </div>
         )}
       </Modal>
+
+      <Modal
+        open={directOpen}
+        title="直接加义工时"
+        onClose={() => !directSubmitting && setDirectOpen(false)}
+        footer={
+          <>
+            <Button variant="secondary" onClick={() => setDirectOpen(false)} disabled={directSubmitting}>取消</Button>
+            <Button onClick={submitDirectAdd} disabled={directSubmitting}>
+              {directSubmitting ? '提交中...' : `确认加义工时（${directUserIds.length} 人）`}
+            </Button>
+          </>
+        }
+      >
+        <div className="space-y-4 max-w-xl">
+          <div className="card p-3 bg-primary-50/50 border border-primary-100 rounded-md">
+            <div className="text-sm text-gray-700 leading-relaxed">
+              <div className="font-semibold text-gray-800 mb-1">说明</div>
+              <div className="muted text-xs mb-2 leading-relaxed">
+                · 录入后会作为独立的时长记录挂在虚拟活动「【补录】直接加义工时长」名下<br />
+                · 每次直接加时都会单独保存一条完整记录（含原因），可在明细里逐条追溯<br />
+                · 「原因」将作为该条时长的备注显示
+              </div>
+              <div className="mt-2 pt-2 border-t border-primary-100">
+                <div className="text-sm font-medium text-gray-700 mb-1">
+                  已选择 <span className="text-primary-600 font-bold">{directUserIds.length}</span> 名部员：
+                </div>
+                <div className="text-xs text-gray-600 max-h-24 overflow-auto">
+                  {(() => {
+                    const namesMap = new Map<number, string>();
+                    for (const u of list) namesMap.set(u.id, `${u.class}${u.name}`);
+                    return directUserIds.map((id, i) => (
+                      <span
+                        key={id}
+                        className="inline-block mr-2 mb-1 px-2 py-0.5 bg-white rounded border border-gray-200"
+                      >
+                        {i + 1}. {namesMap.get(id) || `部员ID#${id}`}
+                      </span>
+                    ));
+                  })()}
+                </div>
+              </div>
+            </div>
+          </div>
+          <div>
+            <label className="block text-sm font-semibold mb-1.5">
+              时长（小时）*
+              <span className="ml-2 text-xs text-gray-500 font-normal">支持 0.5h / 1h / 1.5h 等</span>
+            </label>
+            <Input
+              type="number"
+              min={0.1}
+              step={0.1}
+              value={directHours}
+              onChange={(e) => setDirectHours(e.target.value)}
+              placeholder="请输入要加的义工小时数（必填，> 0）"
+            />
+          </div>
+          <div>
+            <label className="block text-sm font-semibold mb-1.5">
+              原因 / 备注 *
+              <span className="ml-2 text-xs text-red-600 font-normal">必填，将作为该条时长记录的备注保留</span>
+            </label>
+            <Textarea
+              rows={3}
+              value={directReason}
+              onChange={(e) => setDirectReason(e.target.value)}
+              placeholder="例如：协助完成宣传部招新面试；临时值班；特殊贡献奖励等"
+            />
+            <div className="mt-1 text-xs muted">
+              已输入 {directReason.length} 字{directReason.length === 0 ? '（请填写原因后再提交）' : ''}
+            </div>
+          </div>
+          {directError && (
+            <div className="text-sm text-red-600 rounded-md border border-red-200 bg-red-50 px-3 py-2 leading-relaxed">
+              {directError}
+            </div>
+          )}
+        </div>
+      </Modal>
     </div>
   );
 }
diff --git a/server/src/db/index.ts b/server/src/db/index.ts
index da3dbe3..34c78b3 100644
--- a/server/src/db/index.ts
+++ b/server/src/db/index.ts
@@ -136,6 +136,47 @@ export async function initDb() {
     }
   } catch (e) { console.error('User_groups migration error', e); }
 
+  try {
+    const hoursExists = d.prepareCompat(`SELECT name FROM sqlite_master WHERE type='table' AND name='hours'`).get();
+    if (hoursExists) {
+      const uniqueIdx = d.prepareCompat(`
+        SELECT name, sql FROM sqlite_master
+         WHERE type='index' AND tbl_name='hours' AND (unique=1 OR sql LIKE '%UNIQUE%')
+      `).all();
+      const tblSql = (d.prepareCompat(`SELECT sql FROM sqlite_master WHERE type='table' AND name='hours'`).get() as any)?.sql || '';
+      const hasOldUnique = uniqueIdx.length > 0 || tblSql.includes('UNIQUE(activity_id, user_id)');
+      if (hasOldUnique) {
+        console.log('[DB] Migrating hours: drop UNIQUE(activity_id,user_id) constraint, allow multiple rows per activity+user');
+        d.execCompat('BEGIN');
+        d.execCompat(`CREATE TABLE IF NOT EXISTS hours_new (
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          activity_id INTEGER NOT NULL,
+          user_id INTEGER NOT NULL,
+          hours REAL NOT NULL DEFAULT 0,
+          remark TEXT,
+          created_at TEXT NOT NULL DEFAULT (datetime('now','+8 hours')),
+          FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE,
+          FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+        )`);
+        d.execCompat(`
+          INSERT INTO hours_new (id, activity_id, user_id, hours, remark, created_at)
+          SELECT id, activity_id, user_id, hours, remark, created_at FROM hours
+        `);
+        for (const idx of uniqueIdx) {
+          try { d.execCompat(`DROP INDEX IF EXISTS "${idx.name}"`); } catch {}
+        }
+        d.execCompat('DROP TABLE IF EXISTS hours');
+        d.execCompat('ALTER TABLE hours_new RENAME TO hours');
+        d.execCompat('COMMIT');
+        d.save();
+        console.log('[DB] hours UNIQUE constraint migration done');
+      }
+    }
+  } catch (e: any) {
+    console.error('Hours migration error', e);
+    try { d.execCompat('ROLLBACK'); } catch {}
+  }
+
   const adminCount = d.prepareCompat('SELECT COUNT(*) as c FROM admins').get();
   if (!adminCount || adminCount.c === 0) {
     const hash = bcrypt.hashSync('admin123', 10);
diff --git a/server/src/db/schema.sql b/server/src/db/schema.sql
index 433a71f..1350628 100644
--- a/server/src/db/schema.sql
+++ b/server/src/db/schema.sql
@@ -46,8 +46,7 @@ CREATE TABLE IF NOT EXISTS hours (
   remark TEXT,
   created_at TEXT NOT NULL DEFAULT (datetime('now','+8 hours')),
   FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE,
-  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
-  UNIQUE(activity_id, user_id)
+  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
 );
 
 CREATE TABLE IF NOT EXISTS admins (
diff --git a/server/src/routes/hours.ts b/server/src/routes/hours.ts
index 9cd15d0..c8aa058 100644
--- a/server/src/routes/hours.ts
+++ b/server/src/routes/hours.ts
@@ -12,19 +12,19 @@ router.post('/batch', authMiddleware, (req: AuthRequest, res: Response) => {
   const db = getDb();
   try {
     db.execCompat('BEGIN');
-    const upsert = db.prepareCompat(`
+    const delOld = db.prepareCompat('DELETE FROM hours WHERE activity_id = ? AND user_id = ?');
+    const insertNew = db.prepareCompat(`
       INSERT INTO hours (activity_id, user_id, hours, remark)
       VALUES (?,?,?,?)
-      ON CONFLICT(activity_id, user_id) DO UPDATE SET hours=excluded.hours, remark=excluded.remark
     `);
-    const delZero = db.prepareCompat('DELETE FROM hours WHERE activity_id = ? AND user_id = ? AND hours = 0 AND (remark IS NULL OR remark = \'\')');
     for (const it of items) {
       const h = Number(it.hours) || 0;
       const r = (it.remark ?? '').toString();
       if (h === 0 && !r) {
-        delZero.run(activity_id, it.user_id);
+        delOld.run(activity_id, it.user_id);
       } else {
-        upsert.run(activity_id, it.user_id, h, r);
+        delOld.run(activity_id, it.user_id);
+        insertNew.run(activity_id, it.user_id, h, r);
       }
     }
     db.execCompat('COMMIT');
@@ -36,6 +36,77 @@ router.post('/batch', authMiddleware, (req: AuthRequest, res: Response) => {
   }
 });
 
+const DIRECT_ADD_TITLE = '【补录】直接加义工时长';
+
+router.post('/direct-add', authMiddleware, (req: AuthRequest, res: Response) => {
+  const { items } = req.body || {};
+  if (!Array.isArray(items) || items.length === 0) {
+    return res.status(400).json({ error: '请至少选择一名部员' });
+  }
+  const db = getDb();
+  try {
+    const errors: string[] = [];
+    const clean: Array<{ uid: number; user: any; hours: number; reason: string }> = [];
+    for (const it of items) {
+      const uid = Number(it?.user_id);
+      const h = Number(it?.hours);
+      const reason = String(it?.reason ?? '').trim();
+      if (!uid) { errors.push(`无效部员：${JSON.stringify(it)}`); continue; }
+      const user = db.prepareCompat('SELECT id, class, name, volunteer_no FROM users WHERE id = ?').get(uid);
+      if (!user) { errors.push(`部员不存在：${uid}`); continue; }
+      if (!Number.isFinite(h) || h <= 0) {
+        errors.push(`${user.class} ${user.name} 的时长必须大于 0`);
+        continue;
+      }
+      if (!reason) {
+        errors.push(`${user.class} ${user.name} 必须填写原因`);
+        continue;
+      }
+      clean.push({ uid, user, hours: h, reason });
+    }
+    if (errors.length > 0) {
+      return res.status(400).json({ error: errors.join('；') });
+    }
+    db.execCompat('BEGIN');
+    let act = db.prepareCompat('SELECT * FROM activities WHERE title = ?').get(DIRECT_ADD_TITLE) as any;
+    if (!act) {
+      db.prepareCompat(`
+        INSERT INTO activities (title, content, start_time, end_time)
+        VALUES (?, ?, ?, ?)
+      `).run(DIRECT_ADD_TITLE, '管理台直接补录义工时长，不绑定真实活动', '2024-01-01 00:00', '2099-12-31 23:59');
+      act = db.prepareCompat('SELECT * FROM activities WHERE title = ?').get(DIRECT_ADD_TITLE) as any;
+    }
+    const insert = db.prepareCompat(`
+      INSERT INTO hours (activity_id, user_id, hours, remark)
+      VALUES (?,?,?,?)
+    `);
+    const results: any[] = [];
+    for (const c of clean) {
+      insert.run(act.id, c.uid, c.hours, c.reason);
+      results.push({
+        user_id: c.uid,
+        class: c.user.class,
+        name: c.user.name,
+        volunteer_no: c.user.volunteer_no || null,
+        hours: c.hours,
+        reason: c.reason,
+      });
+    }
+    db.execCompat('COMMIT');
+    db.save();
+    res.json({
+      ok: true,
+      added: results.length,
+      total_hours: results.reduce((s, r) => s + r.hours, 0),
+      results,
+      direct_add_activity_id: act.id,
+    });
+  } catch (e: any) {
+    try { db.execCompat('ROLLBACK'); } catch {}
+    res.status(500).json({ error: e.message });
+  }
+});
+
 router.get('/activity/:id', (req: Request, res: Response) => {
   const id = Number(req.params.id);
   const db = getDb();