diff --git a/server/HoneyBox/src/HoneyBox.Model/Converters/StringToIntConverter.cs b/server/HoneyBox/src/HoneyBox.Model/Converters/StringToIntConverter.cs
new file mode 100644
index 00000000..7e0ba432
--- /dev/null
+++ b/server/HoneyBox/src/HoneyBox.Model/Converters/StringToIntConverter.cs
@@ -0,0 +1,44 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace HoneyBox.Model.Converters;
+
+/// <summary>
+/// JSON转换器：将字符串或空值转换为int
+/// </summary>
+public class StringToIntConverter : JsonConverter<int>
+{
+    public override int Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        if (reader.TokenType == JsonTokenType.String)
+        {
+            var stringValue = reader.GetString();
+            if (string.IsNullOrEmpty(stringValue))
+            {
+                return 0;
+            }
+            if (int.TryParse(stringValue, out var result))
+            {
+                return result;
+            }
+            return 0;
+        }
+        
+        if (reader.TokenType == JsonTokenType.Number)
+        {
+            return reader.GetInt32();
+        }
+        
+        if (reader.TokenType == JsonTokenType.Null)
+        {
+            return 0;
+        }
+        
+        return 0;
+    }
+
+    public override void Write(Utf8JsonWriter writer, int value, JsonSerializerOptions options)
+    {
+        writer.WriteNumberValue(value);
+    }
+}
diff --git a/server/HoneyBox/src/HoneyBox.Model/Models/Welfare/WelfareModels.cs b/server/HoneyBox/src/HoneyBox.Model/Models/Welfare/WelfareModels.cs
index 00c9ce69..5f44bace 100644
--- a/server/HoneyBox/src/HoneyBox.Model/Models/Welfare/WelfareModels.cs
+++ b/server/HoneyBox/src/HoneyBox.Model/Models/Welfare/WelfareModels.cs
@@ -550,6 +550,7 @@ public class WelfareBuyRequest
     /// 商品ID
     /// </summary>
     [System.Text.Json.Serialization.JsonPropertyName("goods_id")]
+    [System.Text.Json.Serialization.JsonConverter(typeof(HoneyBox.Model.Converters.StringToIntConverter))]
     public int GoodsId { get; set; }
 
     /// <summary>
@@ -580,6 +581,7 @@ public class WelfareBuyRequest
     /// 优惠券ID
     /// </summary>
     [System.Text.Json.Serialization.JsonPropertyName("coupon_id")]
+    [System.Text.Json.Serialization.JsonConverter(typeof(HoneyBox.Model.Converters.StringToIntConverter))]
     public int CouponId { get; set; }
 }