diff --git a/backend/app/api/v1/studies.py b/backend/app/api/v1/studies.py
index 029246a0..2b505a69 100644
--- a/backend/app/api/v1/studies.py
+++ b/backend/app/api/v1/studies.py
@@ -5,7 +5,9 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.deps import get_current_user, get_db_session, require_roles, require_study_member, require_study_roles
 from app.crud import study as study_crud
+from app.schemas.common import PaginatedResponse
 from app.schemas.study import StudyCreate, StudyRead, StudyUpdate
+from app.utils.pagination import paginate
 
 router = APIRouter()
 
@@ -23,18 +25,20 @@ async def create_study(
     return study
 
 
-@router.get("/", response_model=list[StudyRead])
+@router.get("/", response_model=PaginatedResponse[StudyRead])
 async def list_studies(
     skip: int = 0,
     limit: int = 100,
     db: AsyncSession = Depends(get_db_session),
     current_user=Depends(get_current_user),
-) -> list[StudyRead]:
+) -> PaginatedResponse[StudyRead]:
     if current_user.role == "ADMIN":
         studies = await study_crud.list_studies(db, skip=skip, limit=limit)
+        total = await study_crud.list_studies(db, skip=0, limit=10_000_000)
     else:
         studies = await study_crud.list_studies_for_user(db, current_user.id, skip=skip, limit=limit)
-    return list(studies)
+        total = await study_crud.list_studies_for_user(db, current_user.id, skip=0, limit=10_000_000)
+    return paginate(list(studies), total=len(total))
 
 
 @router.get("/{study_id}", response_model=StudyRead, dependencies=[Depends(require_study_member())])
diff --git a/frontend/src/api/studies.ts b/frontend/src/api/studies.ts
new file mode 100644
index 00000000..8d7aad66
--- /dev/null
+++ b/frontend/src/api/studies.ts
@@ -0,0 +1,4 @@
+import { apiGet } from "./axios";
+import type { ApiListResponse, Study } from "../types/api";
+
+export const fetchStudies = () => apiGet<ApiListResponse<Study>>("/api/v1/studies");
diff --git a/frontend/src/components/Layout.vue b/frontend/src/components/Layout.vue
index 9e76054a..67bfc64e 100644
--- a/frontend/src/components/Layout.vue
+++ b/frontend/src/components/Layout.vue
@@ -1,35 +1,44 @@
 <template>
-  <el-container class="layout">
-    <el-header class="header">
-      <div class="logo">CTMS</div>
-      <div class="user-info">
-        <span>{{ auth.user?.username }}</span>
-        <el-tag size="small" class="role">{{ auth.user?.role }}</el-tag>
-        <el-button size="small" type="danger" @click="onLogout">退出登录</el-button>
-      </div>
-    </el-header>
-    <el-container>
-      <el-aside width="200px" class="aside">
-        <el-menu router default-active="/home">
-          <el-menu-item index="/home">首页</el-menu-item>
-        </el-menu>
-      </el-aside>
-      <el-main>
-        <router-view />
-      </el-main>
-    </el-container>
+<el-container class="layout">
+  <el-header class="header">
+    <div class="logo">CTMS</div>
+    <div class="current-study" v-if="study.currentStudy">
+      <el-tag type="success" size="small">{{ study.currentStudy.name }}</el-tag>
+    </div>
+    <div class="user-info">
+      <StudySelector />
+      <span>{{ auth.user?.username }}</span>
+      <el-tag size="small" class="role">{{ auth.user?.role }}</el-tag>
+      <el-button size="small" type="danger" @click="onLogout">退出登录</el-button>
+    </div>
+  </el-header>
+  <el-container>
+    <el-aside width="200px" class="aside" v-if="study.currentStudy">
+      <el-menu router :default-active="$route.path">
+        <el-menu-item index="/home">首页</el-menu-item>
+        <el-menu-item index="/study/home">项目首页</el-menu-item>
+      </el-menu>
+    </el-aside>
+    <el-main>
+      <router-view />
+    </el-main>
   </el-container>
+</el-container>
 </template>
 
 <script setup lang="ts">
 import { useRouter } from "vue-router";
 import { useAuthStore } from "../store/auth";
+import { useStudyStore } from "../store/study";
+import StudySelector from "./StudySelector.vue";
 
 const auth = useAuthStore();
+const study = useStudyStore();
 const router = useRouter();
 
 const onLogout = () => {
   auth.logout();
+  study.clearCurrentStudy();
   router.push("/login");
 };
 </script>
diff --git a/frontend/src/components/StudySelector.vue b/frontend/src/components/StudySelector.vue
new file mode 100644
index 00000000..d73af61b
--- /dev/null
+++ b/frontend/src/components/StudySelector.vue
@@ -0,0 +1,32 @@
+<template>
+  <el-dropdown>
+    <span class="el-dropdown-link">
+      <el-tag size="small" type="info">
+        {{ study.currentStudy?.name || "未选择项目" }}
+      </el-tag>
+    </span>
+    <template #dropdown>
+      <el-dropdown-menu>
+        <el-dropdown-item @click="goSelect">切换项目</el-dropdown-item>
+        <el-dropdown-item @click="clearStudy">清除当前项目</el-dropdown-item>
+      </el-dropdown-menu>
+    </template>
+  </el-dropdown>
+</template>
+
+<script setup lang="ts">
+import { useRouter } from "vue-router";
+import { useStudyStore } from "../store/study";
+
+const router = useRouter();
+const study = useStudyStore();
+
+const goSelect = () => {
+  router.push("/studies");
+};
+
+const clearStudy = () => {
+  study.clearCurrentStudy();
+  router.push("/studies");
+};
+</script>
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
index 18e568a5..b2748e98 100644
--- a/frontend/src/main.ts
+++ b/frontend/src/main.ts
@@ -5,10 +5,16 @@ import "element-plus/dist/index.css";
 
 import App from "./App.vue";
 import router from "./router";
+import { useStudyStore } from "./store/study";
 
 const app = createApp(App);
-app.use(createPinia());
+const pinia = createPinia();
+app.use(pinia);
 app.use(router);
 app.use(ElementPlus);
 
+// 初始化项目上下文
+const studyStore = useStudyStore();
+studyStore.loadCurrentStudy();
+
 app.mount("#app");
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index aaa4168b..2009224d 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -1,8 +1,11 @@
 import { createRouter, createWebHistory, RouteRecordRaw } from "vue-router";
 import { useAuthStore } from "../store/auth";
+import { useStudyStore } from "../store/study";
 import Layout from "../components/Layout.vue";
 import Home from "../views/Home.vue";
 import Login from "../views/Login.vue";
+import StudyList from "../views/StudyList.vue";
+import StudyHome from "../views/StudyHome.vue";
 
 const routes: RouteRecordRaw[] = [
   {
@@ -22,6 +25,24 @@ const routes: RouteRecordRaw[] = [
         component: Home,
         meta: { title: "首页" },
       },
+      {
+        path: "study/home",
+        name: "StudyHome",
+        component: StudyHome,
+        meta: { title: "项目首页", requiresStudy: true },
+      },
+    ],
+  },
+  {
+    path: "/studies",
+    component: Layout,
+    children: [
+      {
+        path: "",
+        name: "StudyList",
+        component: StudyList,
+        meta: { title: "项目列表" },
+      },
     ],
   },
 ];
@@ -33,13 +54,18 @@ const router = createRouter({
 
 router.beforeEach((to, _from, next) => {
   const auth = useAuthStore();
+   const studyStore = useStudyStore();
   const token = auth.token;
   if (!to.meta.public && !token) {
     next({ path: "/login" });
     return;
   }
   if (to.path === "/login" && token) {
-    next({ path: "/" });
+    next({ path: studyStore.currentStudy ? "/study/home" : "/home" });
+    return;
+  }
+  if (to.path.startsWith("/study") && !studyStore.currentStudy) {
+    next({ path: "/studies" });
     return;
   }
   next();
diff --git a/frontend/src/store/auth.ts b/frontend/src/store/auth.ts
index d8ac7c36..5a2cda79 100644
--- a/frontend/src/store/auth.ts
+++ b/frontend/src/store/auth.ts
@@ -3,6 +3,7 @@ import { ref } from "vue";
 import { login as apiLogin, fetchMe } from "../api/auth";
 import { setToken, clearToken, getToken } from "../utils/auth";
 import type { UserInfo } from "../types/api";
+import { useStudyStore } from "./study";
 
 export const useAuthStore = defineStore("auth", () => {
   const token = ref<string | null>(getToken());
@@ -31,6 +32,8 @@ export const useAuthStore = defineStore("auth", () => {
     token.value = null;
     user.value = null;
     clearToken();
+    const studyStore = useStudyStore();
+    studyStore.clearCurrentStudy();
   };
 
   return {
diff --git a/frontend/src/store/study.ts b/frontend/src/store/study.ts
new file mode 100644
index 00000000..79f14c20
--- /dev/null
+++ b/frontend/src/store/study.ts
@@ -0,0 +1,37 @@
+import { defineStore } from "pinia";
+import { ref } from "vue";
+import type { Study } from "../types/api";
+
+const STUDY_KEY = "ctms_current_study";
+
+export const useStudyStore = defineStore("study", () => {
+  const currentStudy = ref<Study | null>(null);
+
+  const setCurrentStudy = (study: Study) => {
+    currentStudy.value = study;
+    localStorage.setItem(STUDY_KEY, JSON.stringify(study));
+  };
+
+  const loadCurrentStudy = () => {
+    const raw = localStorage.getItem(STUDY_KEY);
+    if (raw) {
+      try {
+        currentStudy.value = JSON.parse(raw) as Study;
+      } catch {
+        currentStudy.value = null;
+      }
+    }
+  };
+
+  const clearCurrentStudy = () => {
+    currentStudy.value = null;
+    localStorage.removeItem(STUDY_KEY);
+  };
+
+  return {
+    currentStudy,
+    setCurrentStudy,
+    loadCurrentStudy,
+    clearCurrentStudy,
+  };
+});
diff --git a/frontend/src/types/api.ts b/frontend/src/types/api.ts
index 57d04d66..53d67624 100644
--- a/frontend/src/types/api.ts
+++ b/frontend/src/types/api.ts
@@ -25,3 +25,10 @@ export interface UserInfo {
 }
 
 export type UserMeResponse = UserInfo;
+
+export interface Study {
+  id: string;
+  code: string;
+  name: string;
+  status: string;
+}
diff --git a/frontend/src/views/StudyHome.vue b/frontend/src/views/StudyHome.vue
new file mode 100644
index 00000000..4d5fcd5b
--- /dev/null
+++ b/frontend/src/views/StudyHome.vue
@@ -0,0 +1,24 @@
+<template>
+  <div class="study-home" v-if="study.currentStudy">
+    <el-card>
+      <h2>项目首页</h2>
+      <p>项目名称：{{ study.currentStudy.name }}</p>
+      <p>项目编号：{{ study.currentStudy.code }}</p>
+    </el-card>
+  </div>
+  <div v-else class="study-home">
+    <el-alert type="info" title="请先选择一个项目" />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { useStudyStore } from "../store/study";
+
+const study = useStudyStore();
+</script>
+
+<style scoped>
+.study-home {
+  padding: 16px;
+}
+</style>
diff --git a/frontend/src/views/StudyList.vue b/frontend/src/views/StudyList.vue
new file mode 100644
index 00000000..4918464b
--- /dev/null
+++ b/frontend/src/views/StudyList.vue
@@ -0,0 +1,63 @@
+<template>
+  <div class="study-list">
+    <el-card>
+      <div class="header">
+        <h3>项目列表</h3>
+      </div>
+      <el-table :data="studies" style="width: 100%" v-loading="loading">
+        <el-table-column prop="code" label="项目编号" width="160" />
+        <el-table-column prop="name" label="项目名称" />
+        <el-table-column prop="status" label="状态" width="120" />
+        <el-table-column label="操作" width="140">
+          <template #default="scope">
+            <el-button type="primary" size="small" @click="enterStudy(scope.row)">进入项目</el-button>
+          </template>
+        </el-table-column>
+      </el-table>
+    </el-card>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { onMounted, ref } from "vue";
+import { useRouter } from "vue-router";
+import { fetchStudies } from "../api/studies";
+import { useStudyStore } from "../store/study";
+import type { Study } from "../types/api";
+
+const studies = ref<Study[]>([]);
+const loading = ref(false);
+const router = useRouter();
+const studyStore = useStudyStore();
+
+const loadStudies = async () => {
+  loading.value = true;
+  try {
+    const { data } = await fetchStudies();
+    studies.value = data.items;
+  } finally {
+    loading.value = false;
+  }
+};
+
+const enterStudy = (study: Study) => {
+  studyStore.setCurrentStudy(study);
+  router.push("/study/home");
+};
+
+onMounted(() => {
+  loadStudies();
+});
+</script>
+
+<style scoped>
+.study-list {
+  padding: 16px;
+}
+.header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 12px;
+}
+</style>
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