diff --git a/.changeset/service-worker-module-output.md b/.changeset/service-worker-module-output.md
new file mode 100644
index 000000000000..647c0e967432
--- /dev/null
+++ b/.changeset/service-worker-module-output.md
@@ -0,0 +1,6 @@
+---
+'@modern-js/builder': patch
+---
+
+fix: respect output.module for service-worker environment output
+fix: 在 service-worker 环境中遵循 output.module 输出配置
diff --git a/packages/cli/builder/src/plugins/environmentDefaults.ts b/packages/cli/builder/src/plugins/environmentDefaults.ts
index 36cec46f5822..6db582ef4523 100644
--- a/packages/cli/builder/src/plugins/environmentDefaults.ts
+++ b/packages/cli/builder/src/plugins/environmentDefaults.ts
@@ -85,7 +85,12 @@ export const pluginEnvironmentDefaults = (
       const isServiceWorker =
         environment.name === SERVICE_WORKER_ENVIRONMENT_NAME;
 
-      if (isServiceWorker) {
+      if (isServiceWorker && chain.output.get('module') === true) {
+        chain.output.library({
+          ...(chain.output.get('library') || {}),
+          type: 'module',
+        });
+      } else if (isServiceWorker) {
         chain.output.library({
           ...(chain.output.get('library') || {}),
           type: 'commonjs2',
diff --git a/packages/cli/builder/tests/environment.test.ts b/packages/cli/builder/tests/environment.test.ts
index 3a93e8e473f8..6be6e0bb4991 100644
--- a/packages/cli/builder/tests/environment.test.ts
+++ b/packages/cli/builder/tests/environment.test.ts
@@ -2,6 +2,7 @@ import { join } from 'path';
 import { afterEach, describe, expect, it, rstest } from '@rstest/core';
 import { after } from 'lodash';
 import { createBuilder } from '../src';
+import { pluginEnvironmentDefaults } from '../src/plugins/environmentDefaults';
 
 describe('builder environment compat', () => {
   afterEach(() => {
@@ -42,4 +43,41 @@ describe('builder environment compat', () => {
 
     expect(bundlerConfigs).toMatchSnapshot();
   });
+
+  it('should use module library output when service-worker output module is enabled', async () => {
+    let handler: ((chain: any, utils: any) => Promise<void>) | undefined;
+
+    pluginEnvironmentDefaults().setup({
+      modifyBundlerChain: (registeredHandler: any) => {
+        handler =
+          typeof registeredHandler === 'function'
+            ? registeredHandler
+            : registeredHandler.handler;
+      },
+      modifyEnvironmentConfig: () => {},
+      modifyRsbuildConfig: () => {},
+    } as any);
+
+    if (!handler) {
+      throw new Error('Expected environment defaults bundler-chain handler.');
+    }
+
+    const libraryCalls: any[] = [];
+    const chain = {
+      output: {
+        get: (key: string) => (key === 'module' ? true : undefined),
+        library: (value: any) => {
+          libraryCalls.push(value);
+        },
+      },
+    };
+
+    await handler(chain, {
+      environment: {
+        name: 'workerSSR',
+      },
+    });
+
+    expect(libraryCalls).toEqual([{ type: 'module' }]);
+  });
 });