diff --git a/src/api/studentDemo.js b/src/api/studentDemo.js
new file mode 100644
index 0000000..0e6c974
--- /dev/null
+++ b/src/api/studentDemo.js
@@ -0,0 +1,14 @@
+import request from "@/utils/request";
+
+export function createStudentDemoSession(teachingClassId) {
+  return request({ url: "/api/teacher/student-demo-sessions", method: "post", data: { teachingClassId } });
+}
+
+export function exchangeStudentDemoSession(ticket) {
+  return request({
+    url: "/api/student-demo-sessions/exchange",
+    method: "post",
+    data: { ticket },
+    headers: { isToken: false, repeatSubmit: false },
+  });
+}
diff --git a/src/api/studentTrainingAnswer.js b/src/api/studentTrainingAnswer.js
index 5107dd2..45d34bc 100644
--- a/src/api/studentTrainingAnswer.js
+++ b/src/api/studentTrainingAnswer.js
@@ -1,6 +1,12 @@
 import request from "@/utils/request";
+import { getDemoAnswerKey, getStudentDemoSession, isStudentDemo } from "@/utils/studentDemo";
+
+function demoResult(taskKey) {
+  try { return JSON.parse(sessionStorage.getItem(getDemoAnswerKey(taskKey)) || "null"); } catch (error) { return null; }
+}
 
 export function getStudentTrainingAnswer(taskKey, params) {
+  if (isStudentDemo()) return Promise.resolve({ code: 200, data: demoResult(taskKey) });
   return request({
     url: `/api/student-training-answers/${taskKey}`,
     method: "get",
@@ -9,6 +15,11 @@ export function getStudentTrainingAnswer(taskKey, params) {
 }
 
 export function saveStudentTrainingAnswer(taskKey, data) {
+  if (isStudentDemo()) {
+    const answer = { ...data, teachingClassId: getStudentDemoSession()?.userInfo?.demoTeachingClassId };
+    sessionStorage.setItem(getDemoAnswerKey(taskKey), JSON.stringify(answer));
+    return Promise.resolve({ code: 200, data: answer });
+  }
   return request({
     url: `/api/student-training-answers/${taskKey}`,
     method: "post",
@@ -18,6 +29,7 @@ export function saveStudentTrainingAnswer(taskKey, data) {
 }
 
 export function deleteStudentTrainingAnswer(taskKey, params) {
+  if (isStudentDemo()) { sessionStorage.removeItem(getDemoAnswerKey(taskKey)); return Promise.resolve({ code: 200 }); }
   return request({
     url: `/api/student-training-answers/${taskKey}`,
     method: "delete",
@@ -26,6 +38,7 @@ export function deleteStudentTrainingAnswer(taskKey, params) {
 }
 
 export function uploadStudentTrainingFile(data) {
+  if (isStudentDemo()) return Promise.reject(new Error("演示模式不上传文件"));
   return request({
     url: "/common/upload",
     method: "post",
diff --git a/src/layout/components/AppMain.vue b/src/layout/components/AppMain.vue
index 281936a..acb4823 100644
--- a/src/layout/components/AppMain.vue
+++ b/src/layout/components/AppMain.vue
@@ -6,8 +6,9 @@
  * @FilePath: \vue3\src\layout\components\AppMain.vue
  * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
 -->
-<template>
+<template>
   <section :class="mainClass">
+    <div v-if="isDemo" class="student-demo-banner">演示模式：{{ demoClassName }}<button @click="exitDemo">退出演示</button></div>
     <router-view v-slot="{ Component, route }">
       <keep-alive :include="tagsViewStore.cachedViews">
         <component v-if="!route.meta.link" :is="Component" :key="route.path" />
@@ -23,12 +24,16 @@ import { dynamicRoutes } from "@/router";
 import iframeToggle from "./IframeToggle/index";
 import useTagsViewStore from "@/store/modules/tagsView";
 import { getUserInfo } from "@/utils/auth";
-import useUserStore from "@/store/modules/user";
+import useUserStore from "@/store/modules/user";
+import { clearStudentDemoSession, getStudentDemoSession, isStudentDemo } from "@/utils/studentDemo";
 const userStore = useUserStore();
 const tagsViewStore = useTagsViewStore();
 const route = useRoute();
 const router = useRouter();
 const role = ref(JSON.parse(getUserInfo()).roleId);
+const isDemo = computed(() => isStudentDemo());
+const demoClassName = computed(() => getStudentDemoSession()?.userInfo?.className || "教学班");
+function exitDemo() { clearStudentDemoSession(); window.location.replace("/student-demo"); }
 const mainClass = computed(() => {
   if (Number(role.value) === 4) return "app-main";
   if (Number(role.value) === 3) return "teacher-main";
@@ -81,6 +86,7 @@ function useTimeRecorder() {
 }
 const { start, end, reset } = useTimeRecorder();
 const getCurrentTeachingClassId = async () => {
+  if (isDemo.value) return getStudentDemoSession()?.userInfo?.demoTeachingClassId || "";
   const cachedClassId = proxy.$cache.session.get("currentTeachingClassId");
   if (cachedClassId) return cachedClassId;
   const res = await indexApi.getCurrentTeachingClass({ userId: userStore.userInfo.userId });
@@ -91,6 +97,7 @@ const getCurrentTeachingClassId = async () => {
   return classId;
 };
 router.beforeEach(async (to, from, next) => {
+  if (isDemo.value) { next(); return; }
   const disabledTitles = proxy.$cache.session.getJSON("disabledTitles");
   const routess = Array.isArray(disabledTitles) ? disabledTitles : [];
   // 获取当前和上一个模块
@@ -149,6 +156,7 @@ router.beforeEach(async (to, from, next) => {
   background: url("@/assets/images/背景.webp") no-repeat;
   background-size: 100% 100%;
 }
+.student-demo-banner{position:sticky;top:0;z-index:30;display:flex;justify-content:space-between;padding:8px 18px;color:#fff;background:#b45309}.student-demo-banner button{border:0;border-radius:4px;padding:3px 10px;cursor:pointer}
 .app-main2 {
   min-height: calc(100vh - 50px);
   width: 100%;
diff --git a/src/permission.js b/src/permission.js
index 6f16c63..839c5a7 100644
--- a/src/permission.js
+++ b/src/permission.js
@@ -18,7 +18,7 @@ import useSettingsStore from "@/store/modules/settings";
 import usePermissionStore from "@/store/modules/permission";
 NProgress.configure({ showSpinner: false });
 
-const whiteList = ["/login", "/register"];
+const whiteList = ["/login", "/register", "/student-demo"];
 
 router.beforeEach((to, from, next) => {
   NProgress.start();
diff --git a/src/router/index.js b/src/router/index.js
index 937758c..c32a9b5 100644
--- a/src/router/index.js
+++ b/src/router/index.js
@@ -57,8 +57,8 @@ export const constantRoutes = [
     component: () => import("@/views/login"),
     hidden: true,
   },
-  {
-    path: "/register",
+  {
+    path: "/register",
     component: () => import("@/views/register"),
     hidden: true,
   },
@@ -134,6 +134,11 @@ export const dynamicRoutes = [
       },
     ],
   },
+  {
+    path: "/student-demo",
+    component: () => import("@/views/studentDemo/index.vue"),
+    hidden: true,
+  },
   // 互联网产品开发基础
   {
     path: "/foundation",
diff --git a/src/utils/auth.js b/src/utils/auth.js
index b7604e1..55a041a 100644
--- a/src/utils/auth.js
+++ b/src/utils/auth.js
@@ -1,24 +1,28 @@
-import Cookies from "js-cookie";
+import Cookies from "js-cookie";
+import { clearStudentDemoSession, getStudentDemoSession, isStudentDemo } from "@/utils/studentDemo";
 
 const TokenKey = "Admin-Token";
 const user = "UserInfo";
-export function getToken() {
-  return Cookies.get(TokenKey);
+export function getToken() {
+  return getStudentDemoSession()?.token || Cookies.get(TokenKey);
 }
 
 export function setToken(token) {
   return Cookies.set(TokenKey, token);
 }
 
-export function removeToken() {
-  return Cookies.remove(TokenKey);
+export function removeToken() {
+  if (isStudentDemo()) return clearStudentDemoSession();
+  return Cookies.remove(TokenKey);
 }
 export function setUserInfo(userinfo) {
   return Cookies.set(user, userinfo);
 }
-export function getUserInfo() {
-  return Cookies.get(user);
-}
-export function removeUserInfo() {
-  return Cookies.remove(user);
-}
+export function getUserInfo() {
+  const demo = getStudentDemoSession();
+  return demo?.userInfo ? JSON.stringify(demo.userInfo) : Cookies.get(user);
+}
+export function removeUserInfo() {
+  if (isStudentDemo()) return clearStudentDemoSession();
+  return Cookies.remove(user);
+}
diff --git a/src/utils/studentDemo.js b/src/utils/studentDemo.js
new file mode 100644
index 0000000..3a588df
--- /dev/null
+++ b/src/utils/studentDemo.js
@@ -0,0 +1,30 @@
+export const STUDENT_DEMO_STORAGE_KEY = "student-demo-session";
+
+export function getStudentDemoSession() {
+  try {
+    const value = sessionStorage.getItem(STUDENT_DEMO_STORAGE_KEY);
+    return value ? JSON.parse(value) : null;
+  } catch (error) {
+    return null;
+  }
+}
+
+export function isStudentDemo() {
+  return Boolean(getStudentDemoSession()?.token);
+}
+
+export function saveStudentDemoSession(login) {
+  sessionStorage.setItem(STUDENT_DEMO_STORAGE_KEY, JSON.stringify({
+    token: login.token,
+    userInfo: login,
+    expiresAt: Date.now() + 30 * 60 * 1000,
+  }));
+}
+
+export function clearStudentDemoSession() {
+  sessionStorage.removeItem(STUDENT_DEMO_STORAGE_KEY);
+}
+
+export function getDemoAnswerKey(taskKey) {
+  return `student-demo-answer:${getStudentDemoSession()?.userInfo?.demoTeachingClassId || ""}:${taskKey}`;
+}
diff --git a/src/views/components/TrainingAiEvaluation.vue b/src/views/components/TrainingAiEvaluation.vue
index 23ceab8..03f7573 100644
--- a/src/views/components/TrainingAiEvaluation.vue
+++ b/src/views/components/TrainingAiEvaluation.vue
@@ -1,5 +1,7 @@
 <template>
   <aside class="training-ai-evaluation" aria-label="AI实训评价">
+    <section v-if="isDemo" class="evaluation-panel"><h3>演示模式</h3><p class="evaluation-panel__hint">为避免产生外部调用和保存评价数据，AI 助学与助评在演示模式下不可用。</p></section>
+    <template v-else>
     <section class="evaluation-panel">
       <div class="evaluation-panel__header">
         <div>
@@ -56,12 +58,14 @@
         </ul>
       </div>
     </section>
+    </template>
   </aside>
 </template>
 
 <script setup>
 import { getAiTrainingEvaluation, requestAiTrainingAssessment, requestAiTrainingHelp } from "@/api/aiTrainingEvaluation";
 import { normalizeEvaluationReports, normalizeOperation } from "./trainingAiEvaluationReport";
+import { isStudentDemo } from "@/utils/studentDemo";
 
 const props = defineProps({
   taskKey: { type: String, default: "" },
@@ -74,6 +78,7 @@ const helpLoading = ref(false);
 const assessmentLoading = ref(false);
 const helpError = ref("");
 const assessmentError = ref("");
+const isDemo = computed(() => isStudentDemo());
 
 const normalizedReports = computed(() => normalizeEvaluationReports(evaluation.value));
 const help = computed(() => normalizedReports.value.help);
diff --git a/src/views/studentDemo/index.vue b/src/views/studentDemo/index.vue
new file mode 100644
index 0000000..e15575f
--- /dev/null
+++ b/src/views/studentDemo/index.vue
@@ -0,0 +1,28 @@
+<template>
+  <main class="student-demo-entry"><p>{{ message }}</p></main>
+</template>
+
+<script setup>
+import { exchangeStudentDemoSession } from "@/api/studentDemo";
+import { saveStudentDemoSession } from "@/utils/studentDemo";
+
+const message = ref("正在连接教师演示会话…");
+
+function receiveTicket(event) {
+  if (event.origin !== window.location.origin || event.source !== window.opener || event.data?.type !== "STUDENT_DEMO_TICKET") return;
+  exchangeStudentDemoSession(event.data.ticket).then((res) => {
+    saveStudentDemoSession(res.data);
+    window.removeEventListener("message", receiveTicket);
+    window.location.replace("/index");
+  }).catch(() => { message.value = "演示链接已失效，请返回教师端重新打开。"; });
+}
+
+onMounted(() => {
+  if (!window.opener) { message.value = "演示链接已失效，请返回教师端重新打开。"; return; }
+  window.addEventListener("message", receiveTicket);
+  window.opener.postMessage({ type: "STUDENT_DEMO_READY" }, window.location.origin);
+});
+onBeforeUnmount(() => window.removeEventListener("message", receiveTicket));
+</script>
+
+<style scoped>.student-demo-entry{display:grid;min-height:100vh;place-items:center;background:#06111d;color:#dff7ff;font-size:18px}</style>
diff --git a/src/views/teacherEnd/trainingTask/index.vue b/src/views/teacherEnd/trainingTask/index.vue
index ed902f4..41d8638 100644
--- a/src/views/teacherEnd/trainingTask/index.vue
+++ b/src/views/teacherEnd/trainingTask/index.vue
@@ -35,6 +35,9 @@
             >
               恢复本班全部默认任务
             </el-button>
+            <el-button v-if="selectedTeachingClass" type="primary" size="small" @click="openStudentDemo">
+              学生端讲解
+            </el-button>
           </div>
         </div>
       </div>
@@ -221,6 +224,7 @@ import {
   restoreClassTrainingTasksDefaults,
   uploadTrainingTaskMaterial,
 } from "@/api/trainingTask";
+import { createStudentDemoSession } from "@/api/studentDemo";
 import * as indexApi from "@/api/teacher";
 import useUserStore from "@/store/modules/user";
 
@@ -531,6 +535,26 @@ async function restoreAllTasksDefaults() {
   }
 }
 
+async function openStudentDemo() {
+  if (!selectedTeachingClass.value) return;
+  const child = window.open("/student-demo", "_blank");
+  if (!child) { proxy?.$modal?.msgError?.("浏览器拦截了演示窗口，请允许弹窗后重试"); return; }
+  try {
+    const res = await createStudentDemoSession(selectedTeachingClassId.value);
+    const ticket = res?.data?.ticket;
+    const listener = (event) => {
+      if (event.origin !== window.location.origin || event.source !== child || event.data?.type !== "STUDENT_DEMO_READY") return;
+      child.postMessage({ type: "STUDENT_DEMO_TICKET", ticket }, window.location.origin);
+      window.removeEventListener("message", listener);
+    };
+    window.addEventListener("message", listener);
+    window.setTimeout(() => window.removeEventListener("message", listener), 60 * 1000);
+  } catch (error) {
+    child.close();
+    proxy?.$modal?.msgError?.("无法创建学生端讲解会话");
+  }
+}
+
 async function confirmRestoreDefault(action) {
   try {
     await proxy?.$modal?.confirm(
diff --git a/src/views/training/GenericTrainingPage.vue b/src/views/training/GenericTrainingPage.vue
index ab1090c..b7fe607 100644
--- a/src/views/training/GenericTrainingPage.vue
+++ b/src/views/training/GenericTrainingPage.vue
@@ -85,7 +85,7 @@
           <p class="upload-tip">{{ page.processUploadTip }}</p>
           <div class="upload-action">
             <input ref="uploadInputRef" class="hidden-file-input" type="file" accept="image/*,.xlsx,.xls,.pdf" @change="handleProcessFileChange" />
-            <button type="button" class="upload-btn" :disabled="uploading" @click="triggerUpload">
+            <button type="button" class="upload-btn" :disabled="uploading || isDemo" @click="triggerUpload">
               <el-icon><Upload /></el-icon>
               {{ uploading ? "上传中..." : "上传产品开发全流程甘特图" }}
             </button>
@@ -173,11 +173,13 @@ import { getStudentTrainingPage } from "./studentTrainingPages";
 import TrainingAiEvaluation from "@/views/components/TrainingAiEvaluation.vue";
 import TrainingAiSidebar from "@/views/components/TrainingAiSidebar.vue";
 import TrainingTaskBrief from "@/views/components/TrainingTaskBrief.vue";
+import { isStudentDemo } from "@/utils/studentDemo";
 
 const route = useRoute();
 const { proxy } = getCurrentInstance();
 
 const pageKey = computed(() => route.meta?.pageKey || route.params?.pageKey);
+const isDemo = computed(() => isStudentDemo());
 const isProductDevelopmentProcess = computed(() => pageKey.value === "product-development-process");
 const remoteTask = ref(null);
 const page = computed(() => mergeTrainingPage(getStudentTrainingPage(pageKey.value), remoteTask.value));
@@ -423,6 +425,7 @@ async function resetTraining() {
 }
 
 function triggerUpload() {
+  if (isDemo.value) { proxy?.$modal?.msgWarning?.("演示模式不上传文件"); return; }
   uploadInputRef.value?.click();
 }
 
diff --git a/tests/student-demo-mode.static.test.cjs b/tests/student-demo-mode.static.test.cjs
new file mode 100644
index 0000000..b0d51c7
--- /dev/null
+++ b/tests/student-demo-mode.static.test.cjs
@@ -0,0 +1,24 @@
+const assert = require("assert");
+const fs = require("fs");
+const path = require("path");
+
+const root = path.resolve(__dirname, "..");
+const read = (file) => fs.readFileSync(path.join(root, file), "utf8");
+
+const auth = read("src/utils/auth.js");
+const demoStorage = read("src/utils/studentDemo.js");
+const api = read("src/api/studentDemo.js");
+const teacherPage = read("src/views/teacherEnd/trainingTask/index.vue");
+const demoPage = read("src/views/studentDemo/index.vue");
+
+assert(auth.includes("getStudentDemoSession") && demoStorage.includes("sessionStorage"), "demo token must use tab-local session storage");
+assert(api.includes("/api/teacher/student-demo-sessions"), "teacher ticket API missing");
+assert(api.includes("/api/student-demo-sessions/exchange"), "ticket exchange API missing");
+assert(teacherPage.includes("学生端讲解"), "teacher entry missing");
+assert(teacherPage.includes("window.open("), "teacher entry must open a new window");
+assert(teacherPage.includes("STUDENT_DEMO_READY"), "teacher must wait for child readiness");
+assert(demoPage.includes("STUDENT_DEMO_TICKET"), "demo page must receive ticket via postMessage");
+assert(demoPage.includes("window.location.origin"), "postMessage must validate origin");
+assert(!teacherPage.includes("ticket="), "ticket must not be sent in URL");
+
+console.log("student demo mode front-end contract passed");