diff --git a/src/utils/index.ts b/src/utils/index.ts
index f869013..44952a2 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -163,7 +163,7 @@ function splitSql(sql: string) {
  * @param {String} sql
  */
 function cleanSql(sql: string) {
-    sql.trim(); // 删除前后空格
+    sql = sql.trim(); // 删除前后空格
     const tokens = lexer(sql);
     let resultSql = '';
     let startIndex = 0;
diff --git a/test/utils/index.test.ts b/test/utils/index.test.ts
index 1215835..3b69ff6 100644
--- a/test/utils/index.test.ts
+++ b/test/utils/index.test.ts
@@ -39,4 +39,12 @@ describe('utils', () => {
         const result = cleanSql(sql);
         expect(result.indexOf('xxx')).toEqual(-1);
     });
+
+    test('clean SQL white spaces', () => {
+        const sql = `   
+        select * from a;    `;
+        const expected = 'select * from a;';
+        const result = cleanSql(sql);
+        expect(result).toEqual(expected);
+    });
 });