diff --git a/Src/Asp.Net/SqlServerTest/Models/CapitalEntity.cs b/Src/Asp.Net/SqlServerTest/Models/CapitalEntity.cs
new file mode 100644
index 000000000..1eff4c9e6
--- /dev/null
+++ b/Src/Asp.Net/SqlServerTest/Models/CapitalEntity.cs
@@ -0,0 +1,517 @@
+using SqlSugar;
+using System;
+using System.Linq;
+using System.Text;
+
+
+namespace OrmTest.Models
+{
+    [SugarTable("RENT_CAPITAL")]
+    public partial class CapitalEntity
+    {
+        public CapitalEntity()
+        {
+
+        }
+
+        
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:False 
+        /// </summary>
+        [SugarColumn(IsPrimaryKey=true)] 
+        public string QrfId {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string RiseId {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Quart {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Rise {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Flat {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string QrfCode {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string QrfName {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string ComProp {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string HallProp {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string FlatProp {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Flatsrc {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Flatbus {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Flatfund {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? Keynum {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? Areas {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string FlatStatus {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string FlatstatusFix {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string FlatstatusAllo {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string FlatalloProp {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string FaceProp {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? Facepara {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? Floorpara {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Prcbymode {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcBase {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcLimt {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcWelf {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcProf {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcDiff {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcGgzl {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcMark {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcPabl {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcPbrh {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? PrcBack {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsWatsew {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Elecapty {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsCenair {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsPipgas {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string GassUserno {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string RentType {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string WatAcctName {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string WatBankno {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string WatAccts {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? Flatlayer {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string FlatCode {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Acces {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Descs {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public DateTime? SynDate {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public DateTime? CreateTime {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string CreateUser {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public DateTime? EditTime {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string EditUser {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsVaild {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsProxy {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsBused {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsMfee {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string MFeeStDate {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsFfee {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string FFeeStDate {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? FeeManage {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public decimal? FeeFixfund {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string ZapProp {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string ZapUser {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public DateTime? ZapTime {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public DateTime? EndfixTime {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Zfsx {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public int? IsProprec {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string EsriLocationx {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string EsriLocationy {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:False 
+        /// </summary>
+         public string CompanyId {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:False 
+        /// </summary>
+         public int IsSysData {get;set;}
+
+        /// <summary>
+        /// Desc:- 
+        /// Default:- 
+        /// Nullable:True 
+        /// </summary>
+         public string Remark {get;set;}
+
+    }
+}
diff --git a/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj b/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
index 23f749e69..7cb50e568 100644
--- a/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
+++ b/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
@@ -47,6 +47,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Models\CapitalEntity.cs" />
     <Compile Include="Config.cs" />
     <Compile Include="Demos\5_CodeFirst.cs" />
     <Compile Include="Demos\6_ComplexModel.cs" />
diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/Query/SingleQuery.cs b/Src/Asp.Net/SqlServerTest/UnitTest/Query/SingleQuery.cs
index c06102a0c..01a872c15 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/Query/SingleQuery.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/Query/SingleQuery.cs
@@ -132,6 +132,19 @@ namespace OrmTest.UnitTest
                    new List<SugarParameter>() {
                         new SugarParameter("@Name0","a")
                    }, t14.Key, t14.Value, "single t14 error ");
+
+
+                var t15 = db.Queryable<CapitalEntity>()
+     .Select(x => new
+     {
+
+         TGYArea = SqlFunc.AggregateSum(SqlFunc.IIF(x.FlatProp == "1", x.Areas, 0))
+     }).ToSql();
+                base.Check("SELECT  SUM(( CASE  WHEN ( [FlatProp] = @FlatProp0 ) THEN [Areas]  ELSE @MethodConst1 END )) AS [TGYArea]  FROM [RENT_CAPITAL] ", new List<SugarParameter>()
+                {
+  new SugarParameter("@FlatProp0","1"),
+  new SugarParameter("@MethodConst1",0)
+                }, t15.Key, t15.Value, "single t15 error");
             }
         }
     }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
index 1fe6b24b7..a56e5695a 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
@@ -231,7 +231,11 @@ namespace SqlSugar
         {
             foreach (var item in args)
             {
-                AppendItem(parameter, name, args, model, item);
+                var expItem = item;
+                if (item is UnaryExpression) {
+                    expItem = (item as UnaryExpression).Operand;
+                }
+                AppendItem(parameter, name, args, model, expItem);
             }
             if (appendArgs != null)
             {