diff --git a/NewLife.Redis/RedisEncoder.cs b/NewLife.Redis/RedisEncoder.cs
index 9aaa6cb..b95f955 100644
--- a/NewLife.Redis/RedisEncoder.cs
+++ b/NewLife.Redis/RedisEncoder.cs
@@ -65,6 +65,9 @@ public virtual Packet Encode(Object value)
             //var str = pk.ToStr().Trim('\"');
             var str = pk.ToStr();
             if (type.GetTypeCode() == TypeCode.String) return str;
+
+            // 支持可空类型
+            type = Nullable.GetUnderlyingType(type) ?? type;
             //if (type.GetTypeCode() != TypeCode.Object) return str.ChangeType(type);
             if (type.GetTypeCode() != TypeCode.Object)
             {