diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index feca74e..5007db5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -27,10 +27,10 @@ jobs:
         run: pnpm i
 
       - name: Check prerelease
-        uses: actions/github-script@v6
         id: prerelease
+        uses: actions/github-script@v6
         with:
-          script: return /-/.test("${{github.ref}}")
+          script: return /-/.test("${{ github.ref }}")
 
       - name: Create Release
         id: create_release
diff --git a/scripts/test.utils.ts b/scripts/test.utils.ts
index 92e97ea..598bf5f 100644
--- a/scripts/test.utils.ts
+++ b/scripts/test.utils.ts
@@ -3,15 +3,13 @@ export function asyncNext() {
 }
 
 export function asyncTimeout(delay = 0) {
-  return new Promise((resolve) => {
-    setTimeout(resolve, delay);
-  });
+  return new Promise((resolve) => setTimeout(resolve, delay));
 }
 
 export function captureError<T = any>(fn: () => void): T {
   try {
     fn();
-    throw new Error('fn not fail...');
+    throw new Error('without Error');
   } catch (err) {
     return err as T;
   }
@@ -35,16 +33,10 @@ export function mockResponse(
   };
 }
 
-export function mockSuccessResponse(
-  headers: AnyObject = {},
-  data: AnyObject = {},
-) {
+export function mockSuccess(headers: AnyObject = {}, data: AnyObject = {}) {
   return mockResponse(200, 'OK', headers, data);
 }
 
-export function mockFailResponse(
-  headers: AnyObject = {},
-  data: AnyObject = {},
-) {
+export function mockFail(headers: AnyObject = {}, data: AnyObject = {}) {
   return mockResponse(400, 'FAIL', headers, data);
 }
diff --git a/src/core/transformURL.ts b/src/core/transformURL.ts
index b3c8bcd..f0c3baa 100644
--- a/src/core/transformURL.ts
+++ b/src/core/transformURL.ts
@@ -1,18 +1,16 @@
 import { buildURL } from '../helpers/buildURL';
 import { combineURL } from '../helpers/combineURL';
-import { dynamicInterpolation, isDynamicURL } from '../helpers/dynamicURL';
+import { interpolation, isDynamicURL } from '../helpers/dynamicURL';
 import { isAbsoluteURL } from '../helpers/isAbsoluteURL';
 import { AxiosRequestConfig } from './Axios';
 
 export function transformURL(config: AxiosRequestConfig): string {
   let url = config.url ?? '';
 
-  if (!isAbsoluteURL(url)) url = combineURL(config.baseURL, url);
+  if (!isAbsoluteURL(url)) url = combineURL(config.baseURL ?? '', url);
 
-  if (isDynamicURL(url)) {
-    const sourceData = Object.assign({}, config.params, config.data);
-    url = dynamicInterpolation(url, sourceData);
-  }
+  if (isDynamicURL(url))
+    url = interpolation(url, Object.assign({}, config.params, config.data));
 
   url = buildURL(url, config.params, config.paramsSerializer);
 
diff --git a/src/helpers/combineURL.ts b/src/helpers/combineURL.ts
index 5ebeb68..123ec8d 100644
--- a/src/helpers/combineURL.ts
+++ b/src/helpers/combineURL.ts
@@ -1,7 +1,4 @@
-const combineREG = /([^:])\/{2,}/g;
-export function combineURL(baseURL = '', url: string): string {
-  const separator = '/';
-  const replaceStr = `$1${separator}`;
-
-  return `${baseURL}${separator}${url}`.replace(combineREG, replaceStr);
+const combineREG = /(^|[^:])\/{2,}/g;
+export function combineURL(baseURL: string, url: string): string {
+  return url ? `${baseURL}/${url}`.replace(combineREG, '$1/') : baseURL;
 }
diff --git a/src/helpers/dynamicURL.ts b/src/helpers/dynamicURL.ts
index dec0166..4bd4a1f 100644
--- a/src/helpers/dynamicURL.ts
+++ b/src/helpers/dynamicURL.ts
@@ -2,10 +2,7 @@ import { isPlainObject } from './isTypes';
 
 const dynamicREG = /\/?(:([a-zA-Z_$][\w-$]*))\/??/g;
 
-export function dynamicInterpolation(
-  url: string,
-  sourceData?: unknown,
-): string {
+export function interpolation(url: string, sourceData?: unknown): string {
   if (!isPlainObject(sourceData)) {
     return url;
   }
diff --git a/test/core/cancel.test.ts b/test/core/cancel.test.ts
index 69cd3bb..b33a9ea 100644
--- a/test/core/cancel.test.ts
+++ b/test/core/cancel.test.ts
@@ -2,7 +2,7 @@ import { describe, test, expect, vi } from 'vitest';
 import {
   asyncNext,
   captureError,
-  mockSuccessResponse,
+  mockSuccess,
   noop,
   asyncTimeout,
 } from 'scripts/test.utils';
@@ -100,7 +100,7 @@ describe('测试 src/helpers/cancel.ts', () => {
 
     source.cancel();
     axios({
-      adapter: ({ success }) => success(mockSuccessResponse()),
+      adapter: ({ success }) => success(mockSuccess()),
       cancelToken: source.token,
     }).catch(canceled);
 
@@ -114,7 +114,7 @@ describe('测试 src/helpers/cancel.ts', () => {
     const source = CancelToken.source();
 
     axios({
-      adapter: ({ success }) => success(mockSuccessResponse()),
+      adapter: ({ success }) => success(mockSuccess()),
       cancelToken: source.token,
     }).catch(canceled);
     source.cancel();
diff --git a/test/helpers/combineURL.test.ts b/test/helpers/combineURL.test.ts
new file mode 100644
index 0000000..a4d8fbb
--- /dev/null
+++ b/test/helpers/combineURL.test.ts
@@ -0,0 +1,25 @@
+import { describe, test, expect } from 'vitest';
+import { combineURL } from 'src/helpers/combineURL';
+
+describe('测试 src/helpers/combineURL.ts', () => {
+  test('应该直接返回第一个参数', () => {
+    expect(combineURL('http://api.com', '')).toBe('http://api.com');
+    expect(combineURL('file://api.com', '')).toBe('file://api.com');
+    expect(combineURL('unknow://api.com', '')).toBe('unknow://api.com');
+  });
+
+  test('应该得到拼接后的结果', () => {
+    expect(combineURL('http://api.com', '/user')).toBe('http://api.com/user');
+    expect(combineURL('file://api.com', '/user')).toBe('file://api.com/user');
+    expect(combineURL('unknow://api.com', '/user')).toBe(
+      'unknow://api.com/user',
+    );
+  });
+
+  test('应该清理多余的斜线', () => {
+    expect(combineURL('//api//', '//user//')).toBe('/api/user/');
+    expect(combineURL('http://api.com//', '//user//')).toBe(
+      'http://api.com/user/',
+    );
+  });
+});