diff --git a/core/common/src/test/java/com/alipay/sofa/rpc/common/utils/FastjsonUtilsTest.java b/core/common/src/test/java/com/alipay/sofa/rpc/common/utils/FastjsonUtilsTest.java
index 3a5f3f760..2c20e35fd 100644
--- a/core/common/src/test/java/com/alipay/sofa/rpc/common/utils/FastjsonUtilsTest.java
+++ b/core/common/src/test/java/com/alipay/sofa/rpc/common/utils/FastjsonUtilsTest.java
@@ -36,11 +36,6 @@ public void setUp() throws Exception {
 
     @Test
     public void testToJSONString() {
-        assertEquals("obj", fastjsonUtilsTest.toJSONString("obj"));
-    }
-
-    @Test
-    public void testToJSONStringWithObject() {
         assertEquals("{\"age\":1,\"name\":\"name\"}", fastjsonUtilsTest.toJSONString(new TestClass(1, "name")));
     }