diff --git a/RedisStudyTest/RedisHashStudyTest.cs b/RedisStudyTest/RedisHashStudyTest.cs
index 9c5071b..d5adf8b 100644
--- a/RedisStudyTest/RedisHashStudyTest.cs
+++ b/RedisStudyTest/RedisHashStudyTest.cs
@@ -231,6 +231,34 @@ namespace RedisStudyTest
             redisDatabase.KeyDelete(preHashKey + student.Id);
         }
 
+        [Fact]
+        public void HashDecrement()
+        {
+            string redisKey = preHashKey + student.Id;
+
+            //Key不存在，则新创建之
+            Assert.Equal(-1, hashStudy.HashDecrement(redisKey, "Id", 1));
+            Assert.Equal(-1, hashStudy.HashGet(redisKey, "Id"));
+
+            //字段不存在，则创建之
+            Assert.Equal(-1, hashStudy.HashDecrement(redisKey, "Age", 1));
+            Assert.Equal(-1, hashStudy.HashGet(redisKey, "Age"));
+
+            //字段不为数据字，则改为数字
+            //注意：是否原注释错误？，因为实际执行抛出异常，而不是操作前改为0
+            Assert.True(hashStudy.HashSet(redisKey, "Name","wanggaofeng"));
+            Assert.Throws<RedisServerException>(()=>hashStudy.HashDecrement(redisKey, "Name", 1));
+            //Assert.Equal(-1, hashStudy.HashGet(redisKey, "Name"));
+
+            //字段减少1
+            Assert.Equal(-2, hashStudy.HashDecrement(redisKey, "Age", 1));
+            //字段减少
+            Assert.Equal(-4, hashStudy.HashDecrement(redisKey, "Age", 2));
+
+            //增加负数时，啥情况
+            Assert.Equal(-2, hashStudy.HashDecrement(redisKey, "Age", -2));
+        }
+
         #endregion
 
         #region 获取