diff --git a/src/main/java/com/budwk/app/zhgh/dayofficework/tour/service/impl/TourUserAssignmentServiceImpl.java b/src/main/java/com/budwk/app/zhgh/dayofficework/tour/service/impl/TourUserAssignmentServiceImpl.java
index 4b39b01d..c5ee8641 100644
--- a/src/main/java/com/budwk/app/zhgh/dayofficework/tour/service/impl/TourUserAssignmentServiceImpl.java
+++ b/src/main/java/com/budwk/app/zhgh/dayofficework/tour/service/impl/TourUserAssignmentServiceImpl.java
@@ -498,7 +498,7 @@ public class TourUserAssignmentServiceImpl extends BaseServiceImpl<TourUserAssig
         if (!TourUserAssignment.PERSON_TYPE_FORMAL.equals(personType)) {
             throw new IllegalArgumentException("只有正式人员可以选择分配路线");
         }
-        NutMap matterInfo = fetchMatterInfo(assignment.getSettingId(), matterId);
+        NutMap matterInfo = fetchMatterInfoForUpdate(assignment.getSettingId(), matterId);
         if (matterInfo == null) {
             throw new IllegalArgumentException("分配路线不存在或未配置线路");
         }
@@ -524,6 +524,13 @@ public class TourUserAssignmentServiceImpl extends BaseServiceImpl<TourUserAssig
         }
         String normalizedPersonType = normalizePersonType(personType);
         NutMap matterInfo = prepareMatterInfoForAssignment(settingId, matterId, normalizedPersonType);
+        // 分工会代报名占用事项最大成团人数；在同一事务中锁定事项行，避免多个分工会同时校验通过后并发写入导致超额。
+        if (matterInfo != null) {
+            matterInfo = fetchMatterInfoForUpdate(settingId, matterInfo.getString("matterId"));
+            if (matterInfo == null) {
+                throw new IllegalArgumentException("疗休养事项不存在或未配置线路");
+            }
+        }
         TourSetting setting = fetchSettingForAssignment(settingId);
         if (setting == null) {
             throw new IllegalArgumentException("疗休养配置不存在");
@@ -1252,6 +1259,21 @@ public class TourUserAssignmentServiceImpl extends BaseServiceImpl<TourUserAssig
     }
 
     private NutMap fetchMatterInfo(String settingId, String matterId) {
+        return fetchMatterInfo(settingId, matterId, false);
+    }
+
+    /**
+     * 在分工会代报名容量校验前锁定事项行，保证同一事项的“统计人数-校验上限-写入台账”串行执行。
+     * 该方法必须在 controller 已开启的事务中调用，FOR UPDATE 锁会持续到事务提交或回滚。
+     */
+    private NutMap fetchMatterInfoForUpdate(String settingId, String matterId) {
+        return fetchMatterInfo(settingId, matterId, true);
+    }
+
+    /**
+     * 查询事项和线路快照信息；forUpdate 为 true 时追加行锁，用于并发容量控制。
+     */
+    private NutMap fetchMatterInfo(String settingId, String matterId, boolean forUpdate) {
         Sql sql = Sqls.create("""
                 SELECT
                     m.id AS matterId,
@@ -1271,7 +1293,7 @@ public class TourUserAssignmentServiceImpl extends BaseServiceImpl<TourUserAssig
                 LEFT JOIN tour_line l ON l.id = m.lineId
                 LEFT JOIN tour_travel_agency ta ON ta.id = l.travelAgencyId
                 $condition
-                """);
+                """ + (forUpdate ? " FOR UPDATE" : ""));
         Cnd cnd = Cnd.NEW();
         cnd.and("m.delFlag", "=", false);
         cnd.and("m.enabled", "=", true);
diff --git a/src/main/resources/views/platform/zhgh/dayofficework/Tour/branchUserAssignment/index.html b/src/main/resources/views/platform/zhgh/dayofficework/Tour/branchUserAssignment/index.html
index 969736cd..a5f19845 100644
--- a/src/main/resources/views/platform/zhgh/dayofficework/Tour/branchUserAssignment/index.html
+++ b/src/main/resources/views/platform/zhgh/dayofficework/Tour/branchUserAssignment/index.html
@@ -122,14 +122,14 @@ layout("/layouts/platform.html"){
                         </el-select>
                     </el-form-item>
                 </el-col>
-                <el-col :span="6">
+                <el-col :span="6" v-if="$auth.hasPermission('tour.branchUserAssignment.selectMatter')">
                     <el-form-item label="分配路线" prop="matterId">
                         <el-select v-model="assignForm.matterId" clearable filterable placeholder="可选，选择后代报名" style="width: 100%" :disabled="assignForm.personType === 'BACKUP'">
                             <el-option v-for="item in assignMatterOptions" :key="item.matterId" :label="matterOptionLabel(item)" :value="item.matterId"></el-option>
                         </el-select>
                     </el-form-item>
                 </el-col>
-                <el-col :span="6">
+                <el-col>
                     <el-form-item label="人员类型" prop="personType">
                         <el-radio-group v-model="assignForm.personType" @change="assignPersonTypeChange">
                             <el-radio-button label="FORMAL">正式人员</el-radio-button>