diff --git a/backend-java/src/main/java/com/competition/modules/pub/service/PublicActivityService.java b/backend-java/src/main/java/com/competition/modules/pub/service/PublicActivityService.java
index 95daa4e..5d97384 100644
--- a/backend-java/src/main/java/com/competition/modules/pub/service/PublicActivityService.java
+++ b/backend-java/src/main/java/com/competition/modules/pub/service/PublicActivityService.java
@@ -8,9 +8,13 @@ import com.competition.common.enums.*;
 import com.competition.common.exception.BusinessException;
 import com.competition.common.result.PageResult;
 import com.competition.modules.biz.contest.entity.BizContest;
+import com.competition.modules.biz.contest.entity.BizContestAttachment;
+import com.competition.modules.biz.contest.entity.BizContestNotice;
 import com.competition.modules.biz.contest.entity.BizContestRegistration;
 import com.competition.modules.biz.contest.entity.BizContestWork;
+import com.competition.modules.biz.contest.mapper.ContestAttachmentMapper;
 import com.competition.modules.biz.contest.mapper.ContestMapper;
+import com.competition.modules.biz.contest.mapper.ContestNoticeMapper;
 import com.competition.modules.biz.contest.mapper.ContestRegistrationMapper;
 import com.competition.modules.biz.contest.mapper.ContestWorkMapper;
 import com.competition.modules.biz.contest.service.IContestWorkService;
@@ -19,6 +23,8 @@ import com.competition.modules.ugc.entity.UgcWork;
 import com.competition.modules.ugc.entity.UgcWorkPage;
 import com.competition.modules.ugc.mapper.UgcWorkMapper;
 import com.competition.modules.ugc.mapper.UgcWorkPageMapper;
+import com.competition.modules.sys.entity.SysUser;
+import com.competition.modules.sys.mapper.SysUserMapper;
 import com.competition.modules.user.entity.UserChild;
 import com.competition.modules.user.mapper.UserChildMapper;
 import lombok.RequiredArgsConstructor;
@@ -42,6 +48,9 @@ public class PublicActivityService {
     private final UserChildMapper userChildMapper;
     private final UgcWorkMapper ugcWorkMapper;
     private final UgcWorkPageMapper ugcWorkPageMapper;
+    private final ContestNoticeMapper contestNoticeMapper;
+    private final ContestAttachmentMapper contestAttachmentMapper;
+    private final SysUserMapper sysUserMapper;
 
     /**
      * 活动列表（公开）
@@ -102,9 +111,60 @@ public class PublicActivityService {
         result.put("workRequirement", contest.getWorkRequirement());
         result.put("resultState", contest.getResultState());
         result.put("resultPublishTime", contest.getResultPublishTime());
+
+        // 活动公告（仅已发布：publish_time 非空），租户范围与活动授权租户一致
+        result.put("notices", listPublishedNoticesForPublic(contest));
+
+        // 附件（与租户端赛事详情一致，便于 C 端下载）
+        LambdaQueryWrapper<BizContestAttachment> attWrapper = new LambdaQueryWrapper<>();
+        attWrapper.eq(BizContestAttachment::getContestId, id);
+        attWrapper.orderByAsc(BizContestAttachment::getCreateTime);
+        List<BizContestAttachment> attachmentEntities = contestAttachmentMapper.selectList(attWrapper);
+        List<Map<String, Object>> attachments = new ArrayList<>();
+        for (BizContestAttachment a : attachmentEntities) {
+            Map<String, Object> am = new LinkedHashMap<>();
+            am.put("id", a.getId());
+            am.put("fileName", a.getFileName());
+            am.put("fileUrl", a.getFileUrl());
+            am.put("fileType", a.getFileType());
+            am.put("format", a.getFormat());
+            am.put("size", a.getSize());
+            attachments.add(am);
+        }
+        result.put("attachments", attachments);
+
         return result;
     }
 
+    /**
+     * 公众端可见公告：已发布且属于该活动授权租户（若有）；无授权租户列表时仅按 contest_id 过滤。
+     */
+    private List<Map<String, Object>> listPublishedNoticesForPublic(BizContest contest) {
+        Long contestId = contest.getId();
+        LambdaQueryWrapper<BizContestNotice> nw = new LambdaQueryWrapper<>();
+        nw.eq(BizContestNotice::getContestId, contestId);
+        nw.isNotNull(BizContestNotice::getPublishTime);
+        List<Integer> tenantInts = contest.getContestTenants();
+        if (tenantInts != null && !tenantInts.isEmpty()) {
+            List<Long> tenantIds = tenantInts.stream().map(Integer::longValue).toList();
+            nw.in(BizContestNotice::getTenantId, tenantIds);
+        }
+        nw.orderByDesc(BizContestNotice::getPublishTime);
+        List<BizContestNotice> rows = contestNoticeMapper.selectList(nw);
+        List<Map<String, Object>> list = new ArrayList<>();
+        for (BizContestNotice n : rows) {
+            Map<String, Object> m = new LinkedHashMap<>();
+            m.put("id", n.getId());
+            m.put("title", n.getTitle());
+            m.put("content", n.getContent());
+            m.put("noticeType", n.getNoticeType());
+            m.put("publishTime", n.getPublishTime());
+            m.put("createTime", n.getCreateTime());
+            list.add(m);
+        }
+        return list;
+    }
+
     /**
      * 查询当前用户的报名信息（包含作品提交状态）
      */
@@ -294,6 +354,15 @@ public class PublicActivityService {
             throw new BusinessException(400, "活动未发布");
         }
 
+        // 子女账号仅允许以本人报名，不可代报其他子女
+        SysUser currentUser = sysUserMapper.selectById(userId);
+        if (currentUser != null && UserType.CHILD.getValue().equals(currentUser.getUserType())) {
+            String pt = dto.getParticipantType() != null ? dto.getParticipantType() : ParticipantType.SELF.getValue();
+            if (ParticipantType.CHILD.getValue().equals(pt) || dto.getChildId() != null) {
+                throw new BusinessException(400, "子女账号只能以本人身份报名");
+            }
+        }
+
         BizContestRegistration reg = new BizContestRegistration();
         reg.setContestId(contestId);
         reg.setUserId(userId);
diff --git a/frontend/src/api/public.ts b/frontend/src/api/public.ts
index 2326212..3ba0436 100644
--- a/frontend/src/api/public.ts
+++ b/frontend/src/api/public.ts
@@ -233,6 +233,35 @@ export interface PublicActivity {
   workRequirement: string
 }
 
+/** 公众端活动详情（含公告、附件等扩展字段） */
+export interface PublicActivityNotice {
+  id: number
+  title: string
+  content: string
+  noticeType?: string
+  publishTime?: string
+  createTime?: string
+}
+
+export interface PublicActivityAttachment {
+  id: number
+  fileName: string
+  fileUrl: string
+  fileType?: string
+  format?: string
+  size?: string
+}
+
+export interface PublicActivityDetail extends PublicActivity {
+  /** 兼容旧字段；详情正文以后端 content 为准 */
+  description?: string
+  notices?: PublicActivityNotice[]
+  attachments?: PublicActivityAttachment[]
+  ageMin?: number
+  ageMax?: number
+  targetCities?: string[]
+}
+
 export const publicActivitiesApi = {
   list: (params?: {
     page?: number
@@ -242,7 +271,8 @@ export const publicActivitiesApi = {
   }): Promise<{ list: PublicActivity[]; total: number }> =>
     publicApi.get("/public/activities", { params }),
 
-  detail: (id: number) => publicApi.get(`/public/activities/${id}`),
+  detail: (id: number): Promise<PublicActivityDetail> =>
+    publicApi.get(`/public/activities/${id}`),
 
   register: (
     id: number,
diff --git a/frontend/src/views/public/ActivityDetail.vue b/frontend/src/views/public/ActivityDetail.vue
index f1c0905..62481b3 100644
--- a/frontend/src/views/public/ActivityDetail.vue
+++ b/frontend/src/views/public/ActivityDetail.vue
@@ -119,7 +119,7 @@
     <div class="detail-card">
       <a-tabs v-model:activeKey="activeTab">
         <a-tab-pane key="info" tab="活动详情">
-          <div class="rich-content" v-html="activity.description"></div>
+          <div class="rich-content" v-html="activityContentHtml"></div>
           <!-- 附件 -->
           <div v-if="activity.attachments?.length" class="attachments">
             <h4>相关附件</h4>
@@ -144,7 +144,7 @@
             <div v-for="notice in activity.notices" :key="notice.id" class="notice-item">
               <h4>{{ notice.title }}</h4>
               <div class="notice-content" v-html="notice.content"></div>
-              <span class="notice-time">{{ formatDate(notice.createTime) }}</span>
+              <span class="notice-time">{{ formatNoticeTime(notice) }}</span>
             </div>
           </div>
         </a-tab-pane>
@@ -159,23 +159,28 @@
       :width="420"
     >
       <div class="register-modal">
-        <p class="modal-desc">请选择参与者：</p>
-        <a-radio-group v-model:value="participantForm.participantType" class="participant-options">
-          <div class="participant-option">
-            <a-radio value="self">我自己</a-radio>
-          </div>
-          <template v-if="children.length">
-            <div v-for="child in children" :key="child.id" class="participant-option">
-              <a-radio :value="'child_' + child.id">
-                子女：{{ child.name }}
-                <span class="child-detail" v-if="child.grade">（{{ child.grade }}）</span>
-              </a-radio>
+        <template v-if="isChildUser">
+          <p class="modal-desc">将使用当前账号报名，确认参加本活动吗？</p>
+        </template>
+        <template v-else>
+          <p class="modal-desc">请选择参与者：</p>
+          <a-radio-group v-model:value="participantForm.participantType" class="participant-options">
+            <div class="participant-option">
+              <a-radio value="self">我自己</a-radio>
             </div>
-          </template>
-        </a-radio-group>
-        <a-button type="link" @click="$router.push('/p/mine/children')" class="add-child-link">
-          + 添加新的子女
-        </a-button>
+            <template v-if="children.length">
+              <div v-for="child in children" :key="child.id" class="participant-option">
+                <a-radio :value="'child_' + child.id">
+                  子女：{{ child.name }}
+                  <span class="child-detail" v-if="child.grade">（{{ child.grade }}）</span>
+                </a-radio>
+              </div>
+            </template>
+          </a-radio-group>
+          <a-button type="link" @click="$router.push('/p/mine/children')" class="add-child-link">
+            + 添加新的子女
+          </a-button>
+        </template>
         <a-button
           type="primary"
           block
@@ -212,13 +217,19 @@ import {
   PictureOutlined, HourglassOutlined, TrophyOutlined,
   TeamOutlined, EnvironmentOutlined, CloseCircleOutlined,
 } from '@ant-design/icons-vue'
-import { publicActivitiesApi, publicChildrenApi, type UserWork } from '@/api/public'
+import {
+  publicActivitiesApi,
+  publicChildrenApi,
+  type PublicActivityDetail,
+  type PublicActivityNotice,
+  type UserWork,
+} from '@/api/public'
 import WorkSelector from './components/WorkSelector.vue'
 import dayjs from 'dayjs'
 
 const route = useRoute()
 const router = useRouter()
-const activity = ref<any>(null)
+const activity = ref<PublicActivityDetail | null>(null)
 const activeTab = ref('info')
 const children = ref<any[]>([])
 const showRegisterModal = ref(false)
@@ -238,6 +249,27 @@ const participantForm = ref({
 
 const formatDate = (d: string) => dayjs(d).format('YYYY-MM-DD')
 
+const formatNoticeTime = (n: PublicActivityNotice) =>
+  formatDate(n.publishTime || n.createTime || '')
+
+/** 活动详情富文本：后端字段为 content */
+const activityContentHtml = computed(() => {
+  const a = activity.value
+  if (!a) return ''
+  return a.content || a.description || ''
+})
+
+/** 子女账号：直接报名，不选参与者、不添加子女 */
+const isChildUser = computed(() => {
+  const raw = localStorage.getItem('public_user')
+  if (!raw) return false
+  try {
+    return JSON.parse(raw).userType === 'child'
+  } catch {
+    return false
+  }
+})
+
 const isLoggedIn = computed(() => !!localStorage.getItem('public_token'))
 
 // 报名是否仍在开放中
@@ -345,15 +377,20 @@ const handleRegister = async () => {
     router.push({ path: '/p/login', query: { redirect: route.fullPath } })
     return
   }
+  if (!activity.value) return
 
   registering.value = true
   try {
-    const val = participantForm.value.participantType
-    const isChild = val.startsWith('child_')
-    await publicActivitiesApi.register(activity.value.id, {
-      participantType: isChild ? 'child' : 'self',
-      childId: isChild ? parseInt(val.replace('child_', '')) : undefined,
-    })
+    if (isChildUser.value) {
+      await publicActivitiesApi.register(activity.value.id, { participantType: 'self' })
+    } else {
+      const val = participantForm.value.participantType
+      const isChild = val.startsWith('child_')
+      await publicActivitiesApi.register(activity.value.id, {
+        participantType: isChild ? 'child' : 'self',
+        childId: isChild ? parseInt(val.replace('child_', '')) : undefined,
+      })
+    }
     message.success('报名成功！')
     showRegisterModal.value = false
     hasRegistered.value = true