diff --git a/.size-limit.js b/.size-limit.js
index a1f3b97a44..8e8736e4c1 100644
--- a/.size-limit.js
+++ b/.size-limit.js
@@ -45,7 +45,7 @@ module.exports = [
   },
   {
     path: "packages/brick-kit/dist/index.esm.js",
-    limit: "110 KB",
+    limit: "111 KB",
   },
   {
     path: "packages/brick-types/dist/index.esm.js",
diff --git a/packages/brick-kit/src/core/Kernel.spec.ts b/packages/brick-kit/src/core/Kernel.spec.ts
index ed444083f3..85a93cba43 100644
--- a/packages/brick-kit/src/core/Kernel.spec.ts
+++ b/packages/brick-kit/src/core/Kernel.spec.ts
@@ -506,6 +506,7 @@ describe("Kernel", () => {
     const appHello: any = {
       app: {
         id: "hello",
+        defaultConfig: { configA: { key1: "value1" } },
       },
     };
     mockStandaloneBootstrap.mockResolvedValueOnce({
@@ -519,7 +520,8 @@ describe("Kernel", () => {
         },
       ],
       userConfig: {
-        configA: "valueA",
+        configA: { key2: "value2" },
+        configB: "valueB",
       },
     });
     spyOnCheckLogin.mockResolvedValueOnce({
@@ -538,7 +540,12 @@ describe("Kernel", () => {
     expect(spyOnRuntimeMicroAppStandalone).toBeCalledTimes(1);
 
     expect(kernel.bootstrapData.storyboards[0].app.userConfig).toEqual({
-      configA: "valueA",
+      configA: { key2: "value2" },
+      configB: "valueB",
+    });
+    expect(kernel.bootstrapData.storyboards[0].app.config).toEqual({
+      configA: { key1: "value1", key2: "value2" },
+      configB: "valueB",
     });
   });
 
diff --git a/packages/brick-kit/src/core/Kernel.ts b/packages/brick-kit/src/core/Kernel.ts
index df1e193b75..081b69cda1 100644
--- a/packages/brick-kit/src/core/Kernel.ts
+++ b/packages/brick-kit/src/core/Kernel.ts
@@ -1,4 +1,4 @@
-import { cloneDeep, pick } from "lodash";
+import { cloneDeep, merge, pick } from "lodash";
 import {
   loadScript,
   prefetchScript,
@@ -10,6 +10,7 @@ import {
   getDllAndDepsByResource,
   scanProcessorsInAny,
   CustomApiInfo,
+  deepFreeze,
 } from "@next-core/brick-utils";
 import i18next from "i18next";
 import * as AuthSdk from "@next-sdk/auth-sdk";
@@ -223,7 +224,7 @@ export class Kernel {
       templatePackages: [],
       ...data,
     } as BootstrapData;
-    // Merge `app.defaultConfig` and `app.userConfig` to `app.config`.
+    // Merge `app.defaultConfig` and `app.userConfig` to `app.config`. Should merge config again in standalone mode when doFulfilStoryboard because static bootstrap.json do not have userConfig.
     processBootstrapResponse(bootstrapResponse);
     this.bootstrapData = {
       ...bootstrapResponse,
@@ -279,11 +280,14 @@ export class Kernel {
           );
         }
         if (appRuntimeData) {
-          // merge user config
+          // Merge `app.defaultConfig` and `app.userConfig` to `app.config`.
           storyboard.app.userConfig = {
             ...storyboard.app.userConfig,
             ...appRuntimeData.userConfig,
           };
+          storyboard.app.config = deepFreeze(
+            merge({}, storyboard.app.defaultConfig, storyboard.app.userConfig)
+          );
           // get inject menus (Actually, appRuntimeData contains both main and inject menus)
           storyboard.meta = {
             ...storyboard.meta,