diff --git a/Storage/Storage/Internal/Query/QueryCompositionalCondition.cs b/Storage/Storage/Internal/Query/QueryCompositionalCondition.cs
index 5a47a32..f2b87d8 100644
--- a/Storage/Storage/Internal/Query/QueryCompositionalCondition.cs
+++ b/Storage/Storage/Internal/Query/QueryCompositionalCondition.cs
@@ -222,11 +222,7 @@ namespace LeanCloud.Storage.Internal {
         }
 
         public void AddCondition(string key, string op, object value) {
-            QueryOperationCondition cond = new QueryOperationCondition {
-                Key = key,
-                Op = op,
-                Value = value
-            };
+            QueryOperationCondition cond = new QueryOperationCondition(key, op, value);
             AddCondition(cond);
         }
 
diff --git a/Storage/Storage/Internal/Query/QueryEqualCondition.cs b/Storage/Storage/Internal/Query/QueryEqualCondition.cs
index eb08dee..9e9e152 100644
--- a/Storage/Storage/Internal/Query/QueryEqualCondition.cs
+++ b/Storage/Storage/Internal/Query/QueryEqualCondition.cs
@@ -2,8 +2,8 @@
 
 namespace LeanCloud.Storage.Internal {
     internal class QueryEqualCondition : IQueryCondition {
-        string key;
-        object value;
+        readonly string key;
+        readonly object value;
 
         public QueryEqualCondition(string key, object value) {
             this.key = key;
diff --git a/Storage/Storage/Internal/Query/QueryOperationCondition.cs b/Storage/Storage/Internal/Query/QueryOperationCondition.cs
index 5f52b6e..40c2b2a 100644
--- a/Storage/Storage/Internal/Query/QueryOperationCondition.cs
+++ b/Storage/Storage/Internal/Query/QueryOperationCondition.cs
@@ -2,29 +2,27 @@
 
 namespace LeanCloud.Storage.Internal {
     internal class QueryOperationCondition : IQueryCondition {
-        public string Key {
-            get; set;
-        }
+        readonly string key;
+        readonly string op;
+        readonly object value;
 
-        public string Op {
-            get; set;
-        }
-
-        public object Value {
-            get; set;
+        public QueryOperationCondition(string key, string op, object value) {
+            this.key = key;
+            this.op = op;
+            this.value = value;
         }
 
         public bool Equals(IQueryCondition other) {
             if (other is QueryOperationCondition otherCond) {
-                return Key == otherCond.Key && Op == otherCond.Op;
+                return key == otherCond.key && op == otherCond.op;
             }
             return false;
         }
 
         public IDictionary<string, object> ToJSON() {
             return new Dictionary<string, object> {
-                { Key, new Dictionary<string, object> {
-                    { Op, Value }
+                { key, new Dictionary<string, object> {
+                    { op, value }
                 } }
             };
         }