diff --git a/src/App.vue b/src/App.vue
index cc30817..417aa13 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,12 +1,27 @@
 <script setup>
-import { onLaunch } from "@dcloudio/uni-app";
+import { onLaunch, onShow } from "@dcloudio/uni-app";
 import { useUserStore } from "@/store";
 import userApi from "@/api/user";
+import { handleEntry } from "@/utils/nav";
 
-onLaunch(() => {
+/**
+ * 启动/唤起参数 → 统一的入口对象。
+ * ⚠️ 只取 options.query：App 层的 options.scene 是「场景值」（数字），
+ * 小程序码真正的 scene 字符串在 options.query.scene 里，不能用前者覆盖后者。
+ */
+const entryParams = (options) => ({ ...((options && options.query) || {}) });
+
+onLaunch((options) => {
   useUserStore().restore();
   // 本地若留有注销回执，查一次清理进度（无回执时不发请求），完成即丢弃
   userApi.fetchErasureStatus();
+  // 扫码进入：冷启动参数在 onLaunch（页面 onLoad 也会带，双保险）
+  handleEntry(entryParams(options));
+});
+
+onShow((options) => {
+  // 后台被再次扫码唤起：页面 onLoad 不会重跑，参数只在这里
+  handleEntry(entryParams(options));
 });
 </script>
 
diff --git a/src/pages/index/index.vue b/src/pages/index/index.vue
index 64a0b70..e77d2cf 100644
--- a/src/pages/index/index.vue
+++ b/src/pages/index/index.vue
@@ -2,11 +2,21 @@
 /**
  * 主包壳页面：主页 / 权益 / 我的 三块面板同屏共存，底部 Tab 栏只渲染一次
  * ---------------------------------------------------------------------------
+ * 扫码入口：二维码指向本页并带商家 id（`merchant_id` / `scene` / `q` 三种来源都认），
+ * 进来自动切到权益 Tab 再打开商家详情 —— 取值见 utils/nav.js 的 pickMerchantId / handleEntry。
  */
-import { onMounted, ref } from "vue";
-import { onShow } from "@dcloudio/uni-app";
+import { nextTick, onMounted, ref } from "vue";
+import { onLoad, onShow } from "@dcloudio/uni-app";
 import { TABS } from "@/constant";
-import { consumePendingTab, registerTabController, setTabQuery } from "@/utils/nav";
+import {
+  consumePendingMerchant,
+  consumePendingTab,
+  goDetail,
+  pickMerchantId,
+  registerTabController,
+  setPendingMerchant,
+  setTabQuery,
+} from "@/utils/nav";
 import HomePanel from "@/views/home/index.vue";
 import BenefitPanel from "@/views/benefit/index.vue";
 import MinePanel from "@/views/mine/index.vue";
@@ -32,17 +42,39 @@ const goTab = (key, query = "") => {
   showPanel(key);
 };
 
+/** Tab 控制器是否已就绪（onShow 可能早于 onMounted，未就绪时不消费扫码参数） */
+let shellReady = false;
+
+/**
+ * 扫码进店：先切权益 Tab 再打开商家详情。
+ * 顺序不能反 —— 先切 Tab，「详情返回」才会落在权益页而不是主页。
+ */
+const runEntry = () => {
+  if (!shellReady) return;
+  const id = consumePendingMerchant();
+  if (!id) return;
+  goTab("benefit");
+  nextTick(() => setTimeout(() => goDetail(id), 0));
+};
+
+onLoad((options) => {
+  setPendingMerchant(pickMerchantId(options));
+});
+
 onMounted(() => {
   // 面板的 onMounted 早于本页 onMounted，此时 ref 已就绪
   registerTabController({ go: goTab, getActive: () => active.value });
   // 从子页 / 登录页切过来：nav 里可能压着待切 Tab（登录回跳、reLaunch 冷启）
   const pending = consumePendingTab();
   goTab(pending?.key || active.value, pending?.query || "");
+  shellReady = true;
+  runEntry();
 });
 
 onShow(() => {
   // 从板块列表 / 详情 / 登录页等返回：让当前面板按需刷新（各家内部有幂等守卫）
   showPanel(active.value);
+  runEntry();
 });
 </script>
 
diff --git a/src/utils/nav.js b/src/utils/nav.js
index f20f5ef..8b6260f 100644
--- a/src/utils/nav.js
+++ b/src/utils/nav.js
@@ -28,6 +28,8 @@ export const registerTabController = (ctl) => {
 let tabQuery = "";
 /** 壳尚未就绪时的待切 Tab */
 let pendingTab = null;
+/** 扫码 / 外链进入时待打开的商家 id */
+let pendingMerchant = "";
 
 export const setTabQuery = (query) => {
   tabQuery = query || "";
@@ -47,6 +49,60 @@ export const consumePendingTab = () => {
   return pending;
 };
 
+/** 记下待打开的商家 id（空值不覆盖已有的） */
+export const setPendingMerchant = (id) => {
+  const value = String(id || "").trim();
+  if (value) pendingMerchant = value;
+};
+
+/** 取出并清空待打开的商家 id */
+export const consumePendingMerchant = () => {
+  const value = pendingMerchant;
+  pendingMerchant = "";
+  return value;
+};
+
+/**
+ * 从启动/唤起参数里取商家 id：兼容四种来源
+ * - `merchant_id` / `merchantId` / `id`：页面 query 直传（小程序码 path、分享链接）
+ * - `scene`：小程序码 getUnlimited，值可能是 `merchant_id=xxx` 也可能是短码
+ * - `q`：普通链接二维码，值是 URL 编码过的原始链接，解码后再取 query
+ */
+export const pickMerchantId = (options) => {
+  const o = options || {};
+  const direct = o.merchant_id || o.merchantId || o.id || "";
+  if (direct) return decodeURIComponent(String(direct)).trim();
+  if (o.scene) {
+    const scene = decodeURIComponent(String(o.scene));
+    return (
+      pickParam(scene, "merchant_id") ||
+      pickParam(scene, "merchantId") ||
+      pickParam(scene, "id") ||
+      scene.trim()
+    );
+  }
+  if (o.q) {
+    const query = decodeURIComponent(String(o.q)).split("?")[1] || "";
+    return pickParam(query, "merchant_id") || pickParam(query, "merchantId") || pickParam(query, "id");
+  }
+  return "";
+};
+
+/**
+ * 入口参数处理（App.onLaunch / App.onShow 调用）：记下商家 id；
+ * 栈顶不是壳页时 reLaunch 回壳 —— 由壳消费 pending 后切权益 Tab 并打开详情。
+ * 冷启动时页面栈还没建立（getCurrentPages 为空），此时只记 pending，不 reLaunch。
+ */
+export const handleEntry = (options) => {
+  const id = pickMerchantId(options);
+  if (!id) return;
+  setPendingMerchant(id);
+  const pages = getCurrentPages();
+  if (!pages.length) return;
+  const top = `/${pages[pages.length - 1].route}`;
+  if (top !== ROUTES.HOME) uni.reLaunch({ url: ROUTES.HOME });
+};
+
 /** query 串取参数 */
 const pickParam = (query, key) => {
   const matched = (query || "").match(new RegExp(`(?:^|&)${key}=([^&]*)`));