diff --git a/src/Neo.Json/JToken.cs b/src/Neo.Json/JToken.cs
index a01beba974..d80ddfea21 100644
--- a/src/Neo.Json/JToken.cs
+++ b/src/Neo.Json/JToken.cs
@@ -9,7 +9,9 @@
 // Redistribution and use in source and binary forms with or without
 // modifications are permitted.
 
+using System.Text.Encodings.Web;
 using System.Text.Json;
+using System.Text.Unicode;
 using static Neo.Json.Utility;
 
 namespace Neo.Json
@@ -19,6 +21,16 @@ namespace Neo.Json
     /// </summary>
     public abstract class JToken
     {
+        public readonly static JavaScriptEncoder DefaultEncoder;
+
+        static JToken()
+        {
+            var textSettings = new TextEncoderSettings(UnicodeRanges.BasicLatin);
+            textSettings.AllowCharacter('+');
+
+            DefaultEncoder = JavaScriptEncoder.Create(textSettings);
+        }
+
         /// <summary>
         /// Represents a <see langword="null"/> token.
         /// </summary>
@@ -239,6 +251,7 @@ public byte[] ToByteArray(bool indented)
             using Utf8JsonWriter writer = new(ms, new JsonWriterOptions
             {
                 Indented = indented,
+                Encoder = DefaultEncoder,
                 SkipValidation = true
             });
             Write(writer);
diff --git a/src/Neo/SmartContract/JsonSerializer.cs b/src/Neo/SmartContract/JsonSerializer.cs
index d2055be7d8..a103978da3 100644
--- a/src/Neo/SmartContract/JsonSerializer.cs
+++ b/src/Neo/SmartContract/JsonSerializer.cs
@@ -96,6 +96,7 @@ public static byte[] SerializeToByteArray(StackItem item, uint maxSize)
             using Utf8JsonWriter writer = new(ms, new JsonWriterOptions
             {
                 Indented = false,
+                Encoder = JToken.DefaultEncoder,
                 SkipValidation = false
             });
             Stack stack = new();
diff --git a/tests/Neo.UnitTests/SmartContract/UT_JsonSerializer.cs b/tests/Neo.UnitTests/SmartContract/UT_JsonSerializer.cs
index fc29c95c12..de9daf3374 100644
--- a/tests/Neo.UnitTests/SmartContract/UT_JsonSerializer.cs
+++ b/tests/Neo.UnitTests/SmartContract/UT_JsonSerializer.cs
@@ -175,10 +175,13 @@ public void JsonTest_Object()
 
             Assert.AreEqual(@"{""test"":true}", parsed.ToString());
 
-            json = @" {""\uAAAA"":   true}";
+            json = @" {""test"":""+""} ";
             parsed = JObject.Parse(json);
+            Assert.AreEqual(@"{""test"":""+""}", parsed.ToString());
 
-            Assert.AreEqual(@"{""\uAAAA"":true}", parsed.ToString());
+            json = @" {""测试"":   true}";
+            parsed = JObject.Parse(json);
+            Assert.AreEqual(@"{""测试"":true}", parsed.ToString());
 
             json = @"{""a"":}";
             Assert.ThrowsException<FormatException>(() => JObject.Parse(json));