diff --git a/src/InterfaceForward.Application/ForwardCore/DefaultForwardFlow.cs b/src/InterfaceForward.Application/ForwardCore/DefaultForwardFlow.cs
index 2e148c9..11a1cb2 100644
--- a/src/InterfaceForward.Application/ForwardCore/DefaultForwardFlow.cs
+++ b/src/InterfaceForward.Application/ForwardCore/DefaultForwardFlow.cs
@@ -421,7 +421,8 @@ public class DefaultForwardFlow : IForwardFlow, ITransientDependency
                 Dictionary<string, string> nameValueCollection;
                 if (context.FormFieldList.Count != 0)
                 {
-                    var field = context.FormFieldList.FirstOrDefault(x => x.Value == GlobalConst.FromMappingBody);
+                    var field = context.FormFieldList.FirstOrDefault(x =>
+                        x.Value is GlobalConst.FromMappingBody or GlobalConst.FromBody);
                     if (field != null) field.Value = body;
                     nameValueCollection = context.FormFieldList.ToDictionary(x => x.Name, x => x.Value);
                 }
@@ -532,17 +533,18 @@ public class DefaultForwardFlow : IForwardFlow, ITransientDependency
         // Query / Header / 表单
         foreach (var item in context.QueryFieldList)
         {
-            item.Value = ReplaceFormPlaceholder(item.Name, item.Value, item.Description);
+            item.Value = ReplaceFormPlaceholder(item.Name, item.Value, item.Description, keepMappingBodyPlaceholder: false);
         }
 
         foreach (var item in context.HeaderFieldList)
         {
-            item.Value = ReplaceFormPlaceholder(item.Name, item.Value, item.Description);
+            item.Value = ReplaceFormPlaceholder(item.Name, item.Value, item.Description, keepMappingBodyPlaceholder: false);
         }
 
         foreach (var item in context.FormFieldList)
         {
-            item.Value = ReplaceFormPlaceholder(item.Name, item.Value, item.Description);
+            // FormUrlEncoded 的 Body KV 保留占位符，交由 SetContentType 用序列化后的 TargetInterfaceInput 填充
+            item.Value = ReplaceFormPlaceholder(item.Name, item.Value, item.Description, keepMappingBodyPlaceholder: true);
         }
 
         // 绑定body部分的字段
@@ -578,7 +580,7 @@ public class DefaultForwardFlow : IForwardFlow, ITransientDependency
             }
         }
 
-        string ReplaceFormPlaceholder(string name, string value, string? description)
+        string ReplaceFormPlaceholder(string name, string value, string? description, bool keepMappingBodyPlaceholder)
         {
             return value switch
             {
@@ -589,9 +591,11 @@ public class DefaultForwardFlow : IForwardFlow, ITransientDependency
                 GlobalConst.DateTime => TurnDate(now, description),
                 GlobalConst.Url => context.TargetInterface.RequestAddress,
                 GlobalConst.FromAccount => context.GetAccountFieldValueOrNull(name) ?? string.Empty,
-                GlobalConst.FromMappingBody => context.TargetInterface.ContentType == ContentType.FormUrlEncoded
-                    ? GlobalConst.FromMappingBody
-                    : JsonConvert.SerializeObject(context.OriginalInterfaceMappedInput),
+                // Body 表单在 FormUrlEncoded 时保留占位符；Query/Header 必须立刻展开，否则会原样发出
+                GlobalConst.FromMappingBody or GlobalConst.FromBody =>
+                    keepMappingBodyPlaceholder && context.TargetInterface.ContentType == ContentType.FormUrlEncoded
+                        ? GlobalConst.FromMappingBody
+                        : JsonConvert.SerializeObject(context.OriginalInterfaceMappedInput),
                 _ => value
             };
         }
diff --git a/src/InterfaceForward.Application/Services/Interface/InterfaceService.cs b/src/InterfaceForward.Application/Services/Interface/InterfaceService.cs
index 2cb11c5..e8ad644 100644
--- a/src/InterfaceForward.Application/Services/Interface/InterfaceService.cs
+++ b/src/InterfaceForward.Application/Services/Interface/InterfaceService.cs
@@ -108,10 +108,7 @@ public class InterfaceService : ApplicationService
 
         // 构造参数
         var paras = await InterfaceRepository.GetParameterListByIdAsync(id);
-        // 入参树形列表
-        res.InParameterList = interfaceEntity.IsUpStream
-            ? paras.Where(x => x.IsInPara && x.ParaKind == ParameterParaKind.Normal).ToList()
-            : [];
+      
         res.RequestBodyParameterList = !interfaceEntity.IsUpStream && interfaceEntity.ContentType is ContentType.Json or ContentType.Xml
             ? paras.Where(x => x.IsInPara && x.ParaKind == ParameterParaKind.Normal).ToList()
             : [];
diff --git a/tests/InterfaceForward.Application.Tests/DefaultForwardFlowTests.cs b/tests/InterfaceForward.Application.Tests/DefaultForwardFlowTests.cs
index 1781af9..b5e505c 100644
--- a/tests/InterfaceForward.Application.Tests/DefaultForwardFlowTests.cs
+++ b/tests/InterfaceForward.Application.Tests/DefaultForwardFlowTests.cs
@@ -96,6 +96,69 @@ public class DefaultForwardFlowTests
         Assert.Equal("{\"orderId\":\"A001\"}", Assert.Single(context.QueryFieldList).Value);
     }
 
+    [Fact]
+    public void ReplacePlaceholder_ShouldExpandQueryFromMappingBodyForFormUrlEncoded()
+    {
+        var flow = new TestForwardFlow();
+        var context = new ForwardCoreContext
+        {
+            TargetInterface = new InterfaceDto
+            {
+                ContentType = ContentType.FormUrlEncoded,
+                RequestAddress = "https://example.com/openapi"
+            },
+            OriginalInterfaceMappedInput = new JObject { ["orderId"] = "A001" },
+            QueryFieldList =
+            [
+                new InterfaceFormFieldDto
+                {
+                    Name = "bizData",
+                    Value = GlobalConst.FromMappingBody
+                }
+            ],
+            FormFieldList =
+            [
+                new InterfaceFormFieldDto
+                {
+                    Name = "notifyBizEventDTO",
+                    Value = GlobalConst.FromMappingBody
+                }
+            ]
+        };
+
+        flow.ReplacePlaceholder(context);
+
+        Assert.Equal("{\"orderId\":\"A001\"}", Assert.Single(context.QueryFieldList).Value);
+        Assert.Equal(GlobalConst.FromMappingBody, Assert.Single(context.FormFieldList).Value);
+    }
+
+    [Fact]
+    public void ReplacePlaceholder_ShouldExpandLegacyFromBodyInQuery()
+    {
+        var flow = new TestForwardFlow();
+        var context = new ForwardCoreContext
+        {
+            TargetInterface = new InterfaceDto
+            {
+                ContentType = ContentType.FormUrlEncoded,
+                RequestAddress = "https://example.com/openapi"
+            },
+            OriginalInterfaceMappedInput = new JObject { ["orderId"] = "A001" },
+            QueryFieldList =
+            [
+                new InterfaceFormFieldDto
+                {
+                    Name = "bizData",
+                    Value = GlobalConst.FromBody
+                }
+            ]
+        };
+
+        flow.ReplacePlaceholder(context);
+
+        Assert.Equal("{\"orderId\":\"A001\"}", Assert.Single(context.QueryFieldList).Value);
+    }
+
     class TestForwardFlow : DefaultForwardFlow
     {
         public void SetContentTypeForTest(ForwardCoreContext context, HttpRequestMessage message)