diff --git a/core/src/main/java/com/taobao/arthas/core/util/ArthasCheckUtils.java b/core/src/main/java/com/taobao/arthas/core/util/ArthasCheckUtils.java
index f540ba49f..ff1503038 100644
--- a/core/src/main/java/com/taobao/arthas/core/util/ArthasCheckUtils.java
+++ b/core/src/main/java/com/taobao/arthas/core/util/ArthasCheckUtils.java
@@ -1,17 +1,17 @@
 package com.taobao.arthas.core.util;
 
 /**
- * 检查工具类
+ * Utils for checks
  * Created by vlinux on 15/5/19.
  */
 public class ArthasCheckUtils {
 
     /**
-     * 比对某个元素是否在集合中<br/>
+     * check whether a component is in an Array<br/>
      *
-     * @param e   元素
-     * @param s   元素集合
-     * @param <E> 元素类型
+     * @param e   component
+     * @param s   array
+     * @param <E> component type
      * @return <br/>
      * (1,1,2,3)        == true
      * (1,2,3,4)        == false
@@ -33,11 +33,11 @@ public class ArthasCheckUtils {
     }
 
     /**
-     * 比对两个对象是否相等<br/>
+     * check whether two components are equal<br/>
      *
-     * @param src    源对象
-     * @param target 目标对象
-     * @param <E>    对象类型
+     * @param src    source component
+     * @param target target component
+     * @param <E>    component type
      * @return <br/>
      * (null, null)    == true
      * (1L,2L)         == false
diff --git a/core/src/test/java/com/taobao/arthas/core/util/ArthasCheckUtilsTest.java b/core/src/test/java/com/taobao/arthas/core/util/ArthasCheckUtilsTest.java
new file mode 100644
index 000000000..30a2f2f0b
--- /dev/null
+++ b/core/src/test/java/com/taobao/arthas/core/util/ArthasCheckUtilsTest.java
@@ -0,0 +1,32 @@
+package com.taobao.arthas.core.util;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * @author earayu
+ */
+public class ArthasCheckUtilsTest {
+
+    @Test
+    public void testIsIn(){
+        Assert.assertTrue(ArthasCheckUtils.isIn(1,1,2,3));
+        Assert.assertFalse(ArthasCheckUtils.isIn(1,2,3,4));
+        Assert.assertTrue(ArthasCheckUtils.isIn(null,1,null,2));
+        Assert.assertFalse(ArthasCheckUtils.isIn(1,null));
+        Assert.assertTrue(ArthasCheckUtils.isIn(1L,1L,2L,3L));
+        Assert.assertFalse(ArthasCheckUtils.isIn(1L,2L,3L,4L));
+        Assert.assertTrue(ArthasCheckUtils.isIn("foo","foo","bar"));
+        Assert.assertFalse(ArthasCheckUtils.isIn("foo","bar","goo"));
+    }
+
+
+    @Test
+    public void testIsEquals(){
+        Assert.assertTrue(ArthasCheckUtils.isEquals(1,1));
+        Assert.assertTrue(ArthasCheckUtils.isEquals(1L,1L));
+        Assert.assertTrue(ArthasCheckUtils.isEquals("foo","foo"));
+        Assert.assertFalse(ArthasCheckUtils.isEquals(1,2));
+        Assert.assertFalse(ArthasCheckUtils.isEquals("foo","bar"));
+    }
+}