diff --git a/apps/web-antd/.env.development b/apps/web-antd/.env.development
index 59a3d9e43..261977932 100644
--- a/apps/web-antd/.env.development
+++ b/apps/web-antd/.env.development
@@ -19,3 +19,6 @@ VITE_INJECT_APP_LOADING=true
 VITE_APP_DEFAULT_USERNAME=admin
 # 默认登录密码
 VITE_APP_DEFAULT_PASSWORD=admin123
+
+# 物联运维平台前端地址（用于业务平台 -> IoT 平台 SSO 跳转）
+VITE_IOT_BASE_URL=http://127.0.0.1:5667
diff --git a/apps/web-antd/.env.production b/apps/web-antd/.env.production
index 2bf6bba25..01be409cd 100644
--- a/apps/web-antd/.env.production
+++ b/apps/web-antd/.env.production
@@ -21,3 +21,6 @@ VITE_INJECT_APP_LOADING=true
 
 # 打包后是否生成dist.zip
 VITE_ARCHIVER=true
+
+# 物联运维平台前端地址（SSO 跳转目标），生产部署时按实际域名修改
+VITE_IOT_BASE_URL=https://iot.example.com
diff --git a/apps/web-antd/src/api/core/sso.ts b/apps/web-antd/src/api/core/sso.ts
new file mode 100644
index 000000000..162dbcb49
--- /dev/null
+++ b/apps/web-antd/src/api/core/sso.ts
@@ -0,0 +1,52 @@
+import { requestClient } from '#/api/request';
+
+/**
+ * SSO 单点登录相关接口（对接 /system/sso/callback）
+ * 用于从其他子系统（如 IoT 运维平台）跳转回来时，用 code 换 access_token
+ */
+export namespace SsoApi {
+  /** 后端 OAuth2 标准响应（snake_case），仅在 API 层内部使用 */
+  export interface SsoCallbackRawResult {
+    access_token: string;
+    refresh_token: string;
+    expires_in: number;
+    token_type: string;
+  }
+  /** 前端统一使用 camelCase */
+  export interface SsoCallbackResult {
+    accessToken: string;
+    refreshToken: string;
+    expiresIn: number;
+    tokenType: string;
+  }
+}
+
+/**
+ * 用 SSO code 换 access_token。
+ * client_secret 不在前端，由后端从配置读取。
+ *
+ * @param clientId 当前系统的 client_id（业务平台 = 'biz'，物联运维 = 'iot'）
+ * @param code 授权码（从 URL 读取）
+ * @param redirectUri 回调地址（必须与发起授权时一致，且需在 OAuth2 客户端的 redirectUris 白名单内）
+ * @param state 发起授权时的随机串，从 URL 读出原样回传（后端校验一致性 + CSRF 防护）
+ */
+export async function ssoCallback(
+  clientId: string,
+  code: string,
+  redirectUri: string,
+  state?: string,
+): Promise<SsoApi.SsoCallbackResult> {
+  const raw = await requestClient.post<SsoApi.SsoCallbackRawResult>(
+    '/system/sso/callback',
+    null,
+    {
+      params: { clientId, code, redirectUri, state },
+    },
+  );
+  return {
+    accessToken: raw.access_token,
+    refreshToken: raw.refresh_token,
+    expiresIn: raw.expires_in,
+    tokenType: raw.token_type,
+  };
+}
diff --git a/apps/web-antd/src/layouts/basic.vue b/apps/web-antd/src/layouts/basic.vue
index 1dc10ee8a..f1405eb23 100644
--- a/apps/web-antd/src/layouts/basic.vue
+++ b/apps/web-antd/src/layouts/basic.vue
@@ -1,20 +1,19 @@
 <script lang="ts" setup>
 import type { NotificationItem } from '@vben/layouts';
 
-import type { SystemTenantApi } from '#/api/system/tenant';
+import type { SystemProjectApi } from '#/api/system/project';
 
 import { computed, onMounted, onUnmounted, ref, watch } from 'vue';
 
-import { useAccess } from '@vben/access';
 import { AuthenticationLoginExpiredModal, useVbenModal } from '@vben/common-ui';
-import { isTenantEnable, useTabs, useWatermark } from '@vben/hooks';
+import { useTabs, useWatermark } from '@vben/hooks';
 import { AntdProfileOutlined, CircleHelp } from '@vben/icons';
 import {
   BasicLayout,
   Help,
   LockScreen,
   Notification,
-  TenantDropdown,
+  ProjectDropdown,
   UserDropdown,
 } from '@vben/layouts';
 import { preferences } from '@vben/preferences';
@@ -29,7 +28,8 @@ import {
   updateAllNotifyMessageRead,
   updateNotifyMessageRead,
 } from '#/api/system/notify/message';
-import { getSimpleTenantList } from '#/api/system/tenant';
+import { authorize } from '#/api/system/oauth2/open';
+import { getSimpleProjectList } from '#/api/system/project';
 import { $t } from '#/locales';
 import { router } from '#/router';
 import { useAuthStore } from '#/store';
@@ -38,7 +38,6 @@ import LoginForm from '#/views/_core/authentication/login.vue';
 const userStore = useUserStore();
 const authStore = useAuthStore();
 const accessStore = useAccessStore();
-const { hasAccessByCodes } = useAccess();
 const { destroyWatermark, updateWatermark } = useWatermark();
 const { closeOtherTabs, refreshTab } = useTabs();
 
@@ -149,33 +148,83 @@ function handleNotificationOpen(open: boolean) {
   handleNotificationGetUnreadCount();
 }
 
-// 租户列表
-const tenants = ref<SystemTenantApi.Tenant[]>([]);
-const tenantEnable = computed(
-  () => hasAccessByCodes(['system:tenant:visit']) && isTenantEnable(),
-);
+// 项目列表
+const projects = ref<SystemProjectApi.Project[]>([]);
 
-/** 获取租户列表 */
-async function handleGetTenantList() {
-  if (tenantEnable.value) {
-    tenants.value = await getSimpleTenantList();
+/** 获取项目列表 */
+async function handleGetProjectList() {
+  projects.value = await getSimpleProjectList();
+  // 仅在当前 projectId 不在返回列表中（未选 / 已删除 / 无权限）时，回退到第一个
+  const currentId = accessStore.projectId;
+  const currentInList =
+    currentId !== null && projects.value.some((p) => p.id === currentId);
+  if (!currentInList) {
+    const firstId = projects.value[0]?.id ?? null;
+    accessStore.setProjectId(firstId as null | number);
   }
 }
 
-/** 处理租户切换 */
-async function handleTenantChange(tenant: SystemTenantApi.Tenant) {
-  if (!tenant || !tenant.id) {
-    message.error('切换租户失败');
+/** 跳转到物联运维平台（OAuth2 授权码无感跳转） */
+const iotLoading = ref(false);
+// env 未配置时按钮直接不渲染，避免把用户带到无效域名
+const iotBaseUrl = import.meta.env.VITE_IOT_BASE_URL as string | undefined;
+/** 生成加密安全的 state 值用于 CSRF 防护 */
+function generateState(): string {
+  if (
+    typeof crypto !== 'undefined' &&
+    typeof crypto.randomUUID === 'function'
+  ) {
+    return crypto.randomUUID();
+  }
+  // 老浏览器兜底：仍使用 getRandomValues，强于 Math.random
+  const buf = new Uint8Array(16);
+  crypto.getRandomValues(buf);
+  return Array.from(buf, (b) => b.toString(16).padStart(2, '0')).join('');
+}
+async function handleGoToIot() {
+  if (iotLoading.value || !iotBaseUrl) return;
+  iotLoading.value = true;
+  try {
+    // 注意：redirectUri 必须与 OAuth2 客户端 redirectUris 白名单完全一致，否则后端拒发 code
+    const redirectUri = `${iotBaseUrl}/sso-callback`;
+    const state = generateState();
+    const redirectUrl = await authorize(
+      'code',
+      'iot', // 物联运维平台的 OAuth2 客户端编号
+      redirectUri,
+      state,
+      true, // auto_approve 跳过授权确认页
+      ['user.read', 'user.write'],
+      [],
+    );
+    if (!redirectUrl) {
+      message.error('获取授权失败，请重试');
+      return;
+    }
+    window.location.href = redirectUrl;
+  } catch (error: any) {
+    message.error(error?.message ?? '跳转物联运维平台失败');
+  } finally {
+    iotLoading.value = false;
+  }
+}
+
+/** 处理项目切换 */
+async function handleProjectChange(project: SystemProjectApi.Project) {
+  if (!project || !project.id) {
+    message.error('切换项目失败');
     return;
   }
-  // 设置访问租户 ID
-  accessStore.setVisitTenantId(tenant.id as number);
+  if (project.id === accessStore.projectId) {
+    return;
+  }
+  // 设置当前项目 ID（axios 拦截器会自动带 project-id 请求头）
+  accessStore.setProjectId(project.id as number);
   // 关闭其他标签页，只保留当前页
   await closeOtherTabs();
-  // 刷新当前页面
+  // 刷新当前页面，重新拉数据
   await refreshTab();
-  // 提示切换成功
-  message.success(`切换当前租户为: ${tenant.name}`);
+  message.success(`切换当前项目为: ${project.name}`);
 }
 
 // ========== 初始化 ==========
@@ -184,8 +233,8 @@ let notifyTimer: null | ReturnType<typeof setInterval> = null;
 onMounted(() => {
   // 首次加载未读数量
   handleNotificationGetUnreadCount();
-  // 获取租户列表
-  handleGetTenantList();
+  // 获取项目列表
+  handleGetProjectList();
   // 轮询刷新未读数量
   notifyTimer = setInterval(
     () => {
@@ -250,14 +299,27 @@ watch(
       />
     </template>
     <template #header-right-1>
-      <div v-if="tenantEnable">
-        <TenantDropdown
-          class="mr-2"
-          :tenant-list="tenants"
-          :visit-tenant-id="accessStore.visitTenantId"
-          @success="handleTenantChange"
-        />
-      </div>
+      <ProjectDropdown
+        v-if="projects.length > 0"
+        class="mr-2"
+        :project-list="projects"
+        :visit-project-id="accessStore.projectId"
+        @success="handleProjectChange"
+      />
+    </template>
+    <template #header-right-2>
+      <button
+        v-if="iotBaseUrl"
+        type="button"
+        class="ml-1 mr-2 flex h-8 cursor-pointer items-center gap-1.5 rounded-full bg-[#1677FF] px-4 text-sm font-medium text-white shadow-sm transition-all hover:bg-[#4096FF] hover:shadow-md disabled:cursor-not-allowed disabled:opacity-60"
+        :disabled="iotLoading"
+        title="进入物联运维平台"
+        @click="handleGoToIot"
+      >
+        <span class="i-lucide:cpu text-base"></span>
+        <span>物联运维</span>
+        <span class="i-lucide:arrow-up-right text-xs opacity-80"></span>
+      </button>
     </template>
     <template #extra>
       <AuthenticationLoginExpiredModal
diff --git a/apps/web-antd/src/router/routes/core.ts b/apps/web-antd/src/router/routes/core.ts
index 22fd0017c..1fa843efc 100644
--- a/apps/web-antd/src/router/routes/core.ts
+++ b/apps/web-antd/src/router/routes/core.ts
@@ -109,6 +109,18 @@ const coreRoutes: RouteRecordRaw[] = [
       },
     ],
   },
+  {
+    name: 'SsoCallback',
+    path: '/sso-callback',
+    component: () => import('#/views/_core/authentication/sso-callback.vue'),
+    meta: {
+      hideInBreadcrumb: true,
+      hideInMenu: true,
+      hideInTab: true,
+      ignoreAccess: true,
+      title: 'SSO 登录中',
+    },
+  },
 ];
 
 export { coreRoutes, fallbackNotFoundRoute };
diff --git a/apps/web-antd/src/store/auth.ts b/apps/web-antd/src/store/auth.ts
index 88d201b27..48daec589 100644
--- a/apps/web-antd/src/store/auth.ts
+++ b/apps/web-antd/src/store/auth.ts
@@ -29,6 +29,42 @@ export const useAuthStore = defineStore('auth', () => {
 
   const loginLoading = ref(false);
 
+  /**
+   * token 写入成功后的共用流程：拉用户信息、跳首页、弹欢迎提示。
+   * authLogin / ssoLogin 共用以避免逻辑漂移。
+   */
+  async function postAuthSuccess(
+    onSuccess?: () => Promise<void> | void,
+  ): Promise<null | UserInfo> {
+    // 登录成功后，如果未设置访问租户，默认使用登录时选择的租户
+    if (accessStore.tenantId && !accessStore.visitTenantId) {
+      accessStore.setVisitTenantId(accessStore.tenantId);
+    }
+
+    // TODO @芋艿：清理掉 accessCodes 相关的逻辑
+    const fetchUserInfoResult = await fetchUserInfo();
+    const userInfo = fetchUserInfoResult.user;
+
+    if (accessStore.loginExpired) {
+      accessStore.setLoginExpired(false);
+    } else {
+      onSuccess
+        ? await onSuccess?.()
+        : await router.push(
+            userInfo?.homePath || preferences.app.defaultHomePath,
+          );
+    }
+
+    if (userInfo?.nickname) {
+      notification.success({
+        description: `${$t('authentication.loginSuccessDesc')}:${userInfo?.nickname}`,
+        duration: 3,
+        message: $t('authentication.loginSuccess'),
+      });
+    }
+    return userInfo;
+  }
+
   /**
    * 异步处理登录操作
    * Asynchronously handle the login process
@@ -41,7 +77,6 @@ export const useAuthStore = defineStore('auth', () => {
     params: Recordable<any>,
     onSuccess?: () => Promise<void> | void,
   ) {
-    // 异步处理用户登录操作并获取 accessToken
     let userInfo: null | UserInfo = null;
     try {
       let loginResult: AuthApi.LoginResult;
@@ -64,52 +99,48 @@ export const useAuthStore = defineStore('auth', () => {
         }
       }
       const { accessToken, refreshToken } = loginResult;
-
-      // 如果成功获取到 accessToken
-      if (accessToken) {
-        accessStore.setAccessToken(accessToken);
-        accessStore.setRefreshToken(refreshToken);
-
-        // 登录成功后，如果未设置访问租户，默认使用登录时选择的租户
-        if (accessStore.tenantId && !accessStore.visitTenantId) {
-          accessStore.setVisitTenantId(accessStore.tenantId);
-        }
-
-        // 获取用户信息并存储到 userStore、accessStore 中
-        // TODO @芋艿：清理掉 accessCodes 相关的逻辑
-        // const [fetchUserInfoResult, accessCodes] = await Promise.all([
-        //   fetchUserInfo(),
-        //   // getAccessCodesApi(),
-        // ]);
-        const fetchUserInfoResult = await fetchUserInfo();
-
-        userInfo = fetchUserInfoResult.user;
-
-        if (accessStore.loginExpired) {
-          accessStore.setLoginExpired(false);
-        } else {
-          onSuccess
-            ? await onSuccess?.()
-            : await router.push(
-                userInfo.homePath || preferences.app.defaultHomePath,
-              );
-        }
-
-        if (userInfo?.nickname) {
-          notification.success({
-            description: `${$t('authentication.loginSuccessDesc')}:${userInfo?.nickname}`,
-            duration: 3,
-            message: $t('authentication.loginSuccess'),
-          });
-        }
+      if (!accessToken) {
+        return { userInfo: null };
       }
+      accessStore.setAccessToken(accessToken);
+      accessStore.setRefreshToken(refreshToken);
+      userInfo = await postAuthSuccess(onSuccess);
     } finally {
       loginLoading.value = false;
     }
 
-    return {
-      userInfo,
-    };
+    return { userInfo };
+  }
+
+  /**
+   * SSO 登录：从其他平台跳转过来时，已经拿到 access_token，跳过密码校验。
+   * 失败（token 空、后续拉用户信息异常）会回滚 token，避免留下空 token 导致刷新循环。
+   */
+  async function ssoLogin(
+    accessToken: string,
+    refreshToken: string,
+    onSuccess?: () => Promise<void> | void,
+  ) {
+    if (!accessToken || !refreshToken) {
+      throw new Error('SSO 登录失败：缺少 accessToken / refreshToken');
+    }
+    let userInfo: null | UserInfo = null;
+    try {
+      loginLoading.value = true;
+      accessStore.setAccessToken(accessToken);
+      accessStore.setRefreshToken(refreshToken);
+      try {
+        userInfo = await postAuthSuccess(onSuccess);
+      } catch (error) {
+        // 回滚 token，避免 Bearer null/空 token 陷入 401 循环
+        accessStore.setAccessToken(null);
+        accessStore.setRefreshToken(null);
+        throw error;
+      }
+    } finally {
+      loginLoading.value = false;
+    }
+    return { userInfo };
   }
 
   async function logout(redirect: boolean = true) {
@@ -155,6 +186,7 @@ export const useAuthStore = defineStore('auth', () => {
   return {
     $reset,
     authLogin,
+    ssoLogin,
     fetchUserInfo,
     loginLoading,
     logout,
diff --git a/apps/web-antd/src/views/_core/authentication/sso-callback.vue b/apps/web-antd/src/views/_core/authentication/sso-callback.vue
new file mode 100644
index 000000000..1540109a7
--- /dev/null
+++ b/apps/web-antd/src/views/_core/authentication/sso-callback.vue
@@ -0,0 +1,62 @@
+<script lang="ts" setup>
+import { onMounted, ref } from 'vue';
+import { useRoute, useRouter } from 'vue-router';
+
+import { LOGIN_PATH } from '@vben/constants';
+
+import { message } from 'ant-design-vue';
+
+import { ssoCallback } from '#/api/core/sso';
+import { CLIENT_ID } from '#/api/request';
+import { useAuthStore } from '#/store';
+
+/**
+ * SSO 回调页
+ *
+ * 场景：从其他子系统（如 IoT 运维平台）跳转回来时，URL 会带上 code 参数：
+ *   biz.xxx.com/sso-callback?code=xxx&state=yyy
+ *
+ * 约束：window.location.origin + '/sso-callback' 必须与发起授权时传的 redirect_uri 完全一致，
+ * 且已登记在后端 OAuth2 客户端的 redirectUris 白名单中，否则 yudao 会拒发 / 换 token。
+ */
+defineOptions({ name: 'SsoCallback' });
+
+const route = useRoute();
+const router = useRouter();
+const authStore = useAuthStore();
+
+const errorMsg = ref<string>('');
+
+onMounted(async () => {
+  const code = route.query.code as string | undefined;
+  // state 必须从 URL 原样回传，否则后端会抛 OAUTH2_GRANT_STATE_MISMATCH
+  const state = (route.query.state as string) || undefined;
+  // 立即清空 URL 查询参数，避免 code 出现在浏览器历史、后退时二次 exchange
+  window.history.replaceState(null, '', window.location.pathname);
+
+  if (!code) {
+    errorMsg.value = 'SSO 登录失败：缺少授权码';
+    message.error(errorMsg.value);
+    await router.replace(LOGIN_PATH);
+    return;
+  }
+
+  try {
+    const redirectUri = `${window.location.origin}/sso-callback`;
+    const tokenResp = await ssoCallback(CLIENT_ID, code, redirectUri, state);
+    // 用拿到的 token 完成登录（会拉用户信息、菜单并跳首页）
+    await authStore.ssoLogin(tokenResp.accessToken, tokenResp.refreshToken);
+  } catch (error: any) {
+    errorMsg.value = error?.message ?? 'SSO 登录失败，请重新登录';
+    message.error(errorMsg.value);
+    await router.replace(LOGIN_PATH);
+  }
+});
+</script>
+
+<template>
+  <div class="flex h-screen items-center justify-center text-base">
+    <span v-if="errorMsg">{{ errorMsg }}</span>
+    <span v-else>正在登录，请稍候...</span>
+  </div>
+</template>
diff --git a/packages/effects/layouts/src/widgets/index.ts b/packages/effects/layouts/src/widgets/index.ts
index 665cdb9e9..7d6eccdb6 100644
--- a/packages/effects/layouts/src/widgets/index.ts
+++ b/packages/effects/layouts/src/widgets/index.ts
@@ -8,6 +8,7 @@ export { default as AuthenticationLayoutToggle } from './layout-toggle.vue';
 export * from './lock-screen';
 export * from './notification';
 export * from './preferences';
+export * from './project-dropdown';
 export * from './tenant-dropdown';
 export * from './theme-toggle';
 export * from './timezone';
diff --git a/packages/effects/layouts/src/widgets/project-dropdown/index.ts b/packages/effects/layouts/src/widgets/project-dropdown/index.ts
new file mode 100644
index 000000000..8ae16ff57
--- /dev/null
+++ b/packages/effects/layouts/src/widgets/project-dropdown/index.ts
@@ -0,0 +1 @@
+export { default as ProjectDropdown } from './project-dropdown.vue';
diff --git a/packages/effects/layouts/src/widgets/project-dropdown/project-dropdown.vue b/packages/effects/layouts/src/widgets/project-dropdown/project-dropdown.vue
new file mode 100644
index 000000000..463d53d09
--- /dev/null
+++ b/packages/effects/layouts/src/widgets/project-dropdown/project-dropdown.vue
@@ -0,0 +1,91 @@
+<script lang="ts" setup>
+import { computed } from 'vue';
+
+import { IconifyIcon } from '@vben/icons';
+
+import {
+  Button,
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuGroup,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from '@vben-core/shadcn-ui';
+
+/**
+ * 窄接口：widget 不依赖 apps/* 的 API 类型，只取下拉展示所需字段。
+ * 消费端若传入更大的 Project 对象会被结构化子类型接收，无兼容问题。
+ */
+interface Project {
+  id?: number;
+  name: string;
+  code?: string;
+  status?: number;
+}
+
+defineOptions({
+  name: 'ProjectDropdown',
+});
+
+const props = defineProps<{
+  projectList?: Project[];
+  visitProjectId?: null | number;
+}>();
+
+const emit = defineEmits(['success']);
+
+const projects = computed(() => props.projectList ?? []);
+
+async function handleChange(id: number | undefined) {
+  if (!id) {
+    return;
+  }
+  const project = projects.value.find((item) => item.id === id);
+  if (!project) {
+    return;
+  }
+  emit('success', project);
+}
+</script>
+<template>
+  <DropdownMenu>
+    <DropdownMenuTrigger>
+      <Button
+        variant="outline"
+        class="hover:bg-accent ml-1 mr-2 h-8 w-32 cursor-pointer rounded-full p-1.5"
+      >
+        <IconifyIcon icon="lucide:folder-kanban" class="mr-2" />
+        {{
+          projects.find((item) => item.id === visitProjectId)?.name ||
+          '请选择项目'
+        }}
+      </Button>
+    </DropdownMenuTrigger>
+    <DropdownMenuContent class="w-40 p-0 pb-1">
+      <DropdownMenuGroup>
+        <DropdownMenuItem
+          v-for="project in projects"
+          :key="project.id"
+          :disabled="project.id === visitProjectId"
+          class="mx-1 flex cursor-pointer items-center rounded-sm py-1 leading-8"
+          @click="handleChange(project.id)"
+        >
+          <template v-if="project.id === visitProjectId">
+            <IconifyIcon icon="lucide:check" class="mr-2" />
+            {{ project.name }}
+          </template>
+          <template v-else>
+            {{ project.name }}
+          </template>
+        </DropdownMenuItem>
+        <DropdownMenuItem
+          v-if="projects.length === 0"
+          disabled
+          class="mx-1 flex cursor-default items-center rounded-sm py-1 text-xs leading-8 opacity-60"
+        >
+          暂无项目
+        </DropdownMenuItem>
+      </DropdownMenuGroup>
+    </DropdownMenuContent>
+  </DropdownMenu>
+</template>