diff --git a/.env.debug b/.env.debug
index 637f41e3..30e7614a 100644
--- a/.env.debug
+++ b/.env.debug
@@ -1,3 +1,4 @@
 VITE_APM_STORE_LOCAL_MODE=true
 VITE_APM_STORE_BASE_URL=/local_amd64-store
 VITE_APM_STORE_STATS_BASE_URL=/local_stats
+VITE_SPARK_BACKEND_BASE_URL=http://127.0.0.1:8000
diff --git a/src/__tests__/unit/accountTypes.test.ts b/src/__tests__/unit/accountTypes.test.ts
index c8983772..09ba85f0 100644
--- a/src/__tests__/unit/accountTypes.test.ts
+++ b/src/__tests__/unit/accountTypes.test.ts
@@ -72,6 +72,7 @@ describe("account shared types", () => {
     };
 
     expect(typeof SPARK_BACKEND_BASE_URL).toBe("string");
+    expect(SPARK_BACKEND_BASE_URL).toMatch(/^https?:\/\//);
     expect(FLARUM_BASE_URL).toContain("bbs.spark-app.store");
     expect(FLARUM_REGISTER_URL).toContain("register");
     expect(user.forumGroups).toEqual(["管理员"]);
diff --git a/src/global/storeConfig.ts b/src/global/storeConfig.ts
index 3f1b2134..d5de8b4b 100644
--- a/src/global/storeConfig.ts
+++ b/src/global/storeConfig.ts
@@ -7,8 +7,11 @@ export const APM_STORE_BASE_URL: string =
 export const APM_STORE_STATS_BASE_URL: string =
   import.meta.env.VITE_APM_STORE_STATS_BASE_URL || "";
 
+export const DEFAULT_SPARK_BACKEND_BASE_URL = "http://127.0.0.1:8000";
+
 export const SPARK_BACKEND_BASE_URL: string =
-  import.meta.env.VITE_SPARK_BACKEND_BASE_URL || "";
+  import.meta.env.VITE_SPARK_BACKEND_BASE_URL ||
+  DEFAULT_SPARK_BACKEND_BASE_URL;
 
 export const FLARUM_BASE_URL = "https://bbs.spark-app.store";
 export const FLARUM_REGISTER_URL = `${FLARUM_BASE_URL}/register`;