diff --git a/src/api/admin/applications.ts b/src/api/admin/applications.ts
index 2f5da78..ebca323 100644
--- a/src/api/admin/applications.ts
+++ b/src/api/admin/applications.ts
@@ -47,6 +47,48 @@ export async function getAdminApplication(
   return data as AdminApplicationDetail
 }
 
+export async function impersonateAdminApplication(
+  competitionId: number,
+  applicationId: number,
+): Promise<{
+  token: string
+  competition_slug: string
+  expires_in: number
+  participant?: { id?: number; mobile?: string | null; name?: string | null }
+}> {
+  try {
+    const { data } = await adminHttp.post<unknown>(
+      `/competitions/${competitionId}/applications/${applicationId}/impersonate`,
+    )
+    if (!data || typeof data !== 'object') throw new Error('代登响应无效')
+    const o = data as Record<string, unknown>
+    if (typeof o.token !== 'string' || !o.token.trim()) throw new Error('代登 Token 无效')
+    if (typeof o.competition_slug !== 'string' || !o.competition_slug.trim()) {
+      throw new Error('赛事标识无效')
+    }
+    return {
+      token: o.token,
+      competition_slug: o.competition_slug,
+      expires_in: typeof o.expires_in === 'number' ? o.expires_in : 1800,
+      participant:
+        o.participant && typeof o.participant === 'object'
+          ? (o.participant as { id?: number; mobile?: string | null; name?: string | null })
+          : undefined,
+    }
+  } catch (error) {
+    if (axios.isAxiosError(error)) {
+      const payload = error.response?.data
+      if (payload && typeof payload === 'object') {
+        const message = (payload as { message?: unknown }).message
+        if (typeof message === 'string' && message.trim()) {
+          throw new Error(message.trim())
+        }
+      }
+    }
+    throw error instanceof Error ? error : new Error('进入选手端失败')
+  }
+}
+
 export async function downloadAdminApplicationFile(
   competitionId: number,
   applicationId: number,
diff --git a/src/config/api.ts b/src/config/api.ts
index 9442f57..169da48 100644
--- a/src/config/api.ts
+++ b/src/config/api.ts
@@ -13,6 +13,9 @@ export const PARTICIPANT_SMS_LOGIN_PATH = '/api/auth/sms/login' as const
 
 export const TOKEN_KEY = 'cxxfds_token' as const
 
+/** 管理员代登选手端标记（sessionStorage） */
+export const ADMIN_IMPERSONATION_FLAG_KEY = 'cxxfds_admin_impersonation' as const
+
 /** 选手端最近一次访问的赛事 slug（用于 / 与旧链接跳转） */
 export const PARTICIPANT_COMPETITION_SLUG_KEY = 'cxxfds_participant_competition_slug' as const
 
diff --git a/src/layouts/MainLayout.vue b/src/layouts/MainLayout.vue
index cf420de..8d5928c 100644
--- a/src/layouts/MainLayout.vue
+++ b/src/layouts/MainLayout.vue
@@ -3,7 +3,7 @@ import { ref, computed, watch, onMounted, onUnmounted } from 'vue'
 import { useRouter, useRoute } from 'vue-router'
 import 'bootstrap/dist/css/bootstrap.min.css'
 import '../styles/prototype-styles.css'
-import { getApiBase, TOKEN_KEY } from '../config/api'
+import { ADMIN_IMPERSONATION_FLAG_KEY, getApiBase, TOKEN_KEY } from '../config/api'
 import {
   brandingFormFromApi,
   emptyBrandingForm,
@@ -101,8 +101,15 @@ function applyParticipantBodyTheme() {
 watch(brand, () => applyParticipantBodyTheme(), { deep: true, immediate: true })
 
 const profileLabel = ref('')
+const isAdminImpersonation = ref(sessionStorage.getItem(ADMIN_IMPERSONATION_FLAG_KEY) === '1')
 
-const roleBadge = computed(() => profileLabel.value || '用户')
+const roleBadge = computed(() => {
+  if (isAdminImpersonation.value) {
+    const label = profileLabel.value.trim()
+    return label ? `管理员代登 · ${label}` : '管理员代登中'
+  }
+  return profileLabel.value || '用户'
+})
 
 async function loadProfile() {
   const t = localStorage.getItem(TOKEN_KEY)
@@ -123,6 +130,8 @@ async function loadProfile() {
 function logout() {
   localStorage.removeItem(TOKEN_KEY)
   localStorage.removeItem('cxxfds_user')
+  sessionStorage.removeItem(ADMIN_IMPERSONATION_FLAG_KEY)
+  isAdminImpersonation.value = false
   const s = participantSlug.value
   if (s) {
     void router.push({ name: 'participant-login', params: { slug: s } })
@@ -133,6 +142,7 @@ function logout() {
 
 onMounted(() => {
   document.body.classList.add('prototype-page', 'user-mobile-no-menu')
+  isAdminImpersonation.value = sessionStorage.getItem(ADMIN_IMPERSONATION_FLAG_KEY) === '1'
   loadProfile()
 })
 
@@ -147,6 +157,13 @@ onUnmounted(() => {
 
 <template>
   <div class="participant-layout">
+    <div
+      v-if="isAdminImpersonation"
+      class="admin-impersonation-banner text-center small py-2 px-3"
+      role="status"
+    >
+      当前为管理员代登选手端，操作将以该选手身份生效。请用完后点击右上角「退出登录」。
+    </div>
     <header class="navbar navbar-expand-lg layout-header">
       <div class="container-fluid px-3 px-lg-4">
         <span class="navbar-brand mb-0 prototype-title">{{ layoutHeaderTitle }}</span>
@@ -211,6 +228,12 @@ onUnmounted(() => {
 </template>
 
 <style scoped>
+.admin-impersonation-banner {
+  background: #fff3cd;
+  color: #664d03;
+  border-bottom: 1px solid #ffecb5;
+}
+
 :deep(a.router-link-active.nav-link) {
   background: #eef7fc;
   color: #052d62;
diff --git a/src/router/index.ts b/src/router/index.ts
index 9d481c3..95e4fe4 100644
--- a/src/router/index.ts
+++ b/src/router/index.ts
@@ -47,6 +47,11 @@ const router = createRouter({
       component: () => import('../views/LoginView.vue'),
       meta: { guestOnly: true },
     },
+    {
+      path: '/c/:slug/impersonate-entry',
+      name: 'participant-impersonate-entry',
+      component: () => import('../views/ParticipantImpersonateEntryView.vue'),
+    },
     {
       path: '/c/:slug/review/login',
       name: 'reviewer-login',
diff --git a/src/views/ParticipantImpersonateEntryView.vue b/src/views/ParticipantImpersonateEntryView.vue
new file mode 100644
index 0000000..ad0e385
--- /dev/null
+++ b/src/views/ParticipantImpersonateEntryView.vue
@@ -0,0 +1,35 @@
+<script setup lang="ts">
+import { onMounted, ref } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import {
+  ADMIN_IMPERSONATION_FLAG_KEY,
+  PARTICIPANT_COMPETITION_SLUG_KEY,
+  TOKEN_KEY,
+} from '../config/api'
+
+const route = useRoute()
+const router = useRouter()
+const error = ref('')
+
+onMounted(() => {
+  const slug = String(route.params.slug ?? '').trim()
+  const token = String(route.query.token ?? '').trim()
+  if (!slug || !token) {
+    error.value = '代登参数无效'
+    return
+  }
+
+  localStorage.setItem(TOKEN_KEY, token)
+  localStorage.setItem(PARTICIPANT_COMPETITION_SLUG_KEY, slug)
+  sessionStorage.setItem(ADMIN_IMPERSONATION_FLAG_KEY, '1')
+
+  void router.replace({ name: 'participant-apply', params: { slug } })
+})
+</script>
+
+<template>
+  <div class="container py-5 text-center">
+    <p v-if="error" class="text-danger">{{ error }}</p>
+    <p v-else class="text-secondary">正在进入选手端…</p>
+  </div>
+</template>
diff --git a/src/views/admin/competition/CompetitionFormView.vue b/src/views/admin/competition/CompetitionFormView.vue
index c198afd..ae84de9 100644
--- a/src/views/admin/competition/CompetitionFormView.vue
+++ b/src/views/admin/competition/CompetitionFormView.vue
@@ -27,9 +27,11 @@ import {
   downloadAdminApplicationFile,
   exportAdminApplications,
   getAdminApplication,
+  impersonateAdminApplication,
   listAdminApplications,
   type AdminApplicationExportMode,
 } from '../../../api/admin/applications'
+import { useAdminAuthStore } from '../../../stores/adminAuth'
 import type {
   AdminApplicationDetail,
   AdminApplicationFileRow,
@@ -79,7 +81,12 @@ const TAB_ITEMS: { tab: TabKey; label: string }[] = [
 const router = useRouter()
 const route = useRoute()
 const competitionStore = useAdminCompetitionStore()
+const adminAuth = useAdminAuthStore()
 const { selectedCompetitionId } = storeToRefs(competitionStore)
+const canImpersonateParticipant = computed(
+  () => (adminAuth.user?.username ?? '').trim() === 'superadmin',
+)
+const impersonatingApplication = ref(false)
 
 const isCreate = () => route.name === 'admin-competition-new'
 
@@ -1046,6 +1053,28 @@ async function downloadApplicationFile(fileId: number, fileName: string | null |
   }
 }
 
+async function openParticipantAsImpersonation() {
+  const cid = competitionId.value
+  const appId = applicationDetail.value?.id
+  if (!cid || !appId || !canImpersonateParticipant.value) return
+  impersonatingApplication.value = true
+  try {
+    const data = await impersonateAdminApplication(cid, appId)
+    const entryPath = `/c/${encodeURIComponent(data.competition_slug)}/impersonate-entry?token=${encodeURIComponent(data.token)}`
+    const href = absoluteUrlFromPath(entryPath)
+    const opened = window.open(href, '_blank', 'noopener,noreferrer')
+    if (!opened) {
+      ElMessage.warning('浏览器拦截了新窗口，请允许弹窗后重试')
+      return
+    }
+    ElMessage.success('已打开选手端（管理员代登，约 30 分钟有效）')
+  } catch (e) {
+    ElMessage.error(e instanceof Error ? e.message : '进入选手端失败')
+  } finally {
+    impersonatingApplication.value = false
+  }
+}
+
 async function openChannelModal(row?: SignupChannelRow) {
   if (!competitionId.value) {
     ElMessage.warning('请先保存赛事基础信息')
@@ -2095,6 +2124,16 @@ onMounted(() => {
     >
       <div v-loading="applicationDetailLoading" class="application-detail">
         <template v-if="applicationDetail">
+          <div v-if="canImpersonateParticipant" class="mb-3 d-flex justify-content-end">
+            <el-button
+              type="warning"
+              plain
+              :loading="impersonatingApplication"
+              @click="openParticipantAsImpersonation"
+            >
+              进入选手端
+            </el-button>
+          </div>
           <el-descriptions :column="2" border class="application-detail-section">
             <el-descriptions-item label="项目编号">{{ applicationDetail.project_code || '—' }}</el-descriptions-item>
             <el-descriptions-item label="状态">