diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MemberInitExpressionResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MemberInitExpressionResolve.cs
index 58c6efb72..603562c81 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MemberInitExpressionResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MemberInitExpressionResolve.cs
@@ -87,7 +87,7 @@ namespace SqlSugar
                         var result = this.Context.DbMehtods.IIF(new MethodCallExpressionModel()
                         {
                             Args = new List<MethodCallExpressionArgs>() {
-                                  new MethodCallExpressionArgs(){ IsMember=true, MemberName=parameter.CommonTempData.ObjToString()+"=1" },
+                                  new MethodCallExpressionArgs(){ IsMember=true, MemberName=parameter.CommonTempData.ObjToString()+"=1",Type=UtilConstants.BoolType  },
                                   new MethodCallExpressionArgs(){ IsMember=true,MemberName=AppendParameter(0)  },
                                   new MethodCallExpressionArgs(){ IsMember=true, MemberName=AppendParameter(1)  }
                            }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/UnaryExpressionResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/UnaryExpressionResolve.cs
index 7f9c41d96..9b31e202c 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/UnaryExpressionResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/UnaryExpressionResolve.cs
@@ -150,7 +150,7 @@ namespace SqlSugar
             var result= this.Context.DbMehtods.IIF(new MethodCallExpressionModel()
             {
                 Args = new List<MethodCallExpressionArgs>() {
-                                  new MethodCallExpressionArgs(){ IsMember=true, MemberName=parameter.CommonTempData.ObjToString()+"=1" },
+                                  new MethodCallExpressionArgs(){ IsMember=true, MemberName=parameter.CommonTempData.ObjToString()+"=1",Type=UtilConstants.BoolType },
                                   new MethodCallExpressionArgs(){ IsMember=true,MemberName=AppendParameter(0)  },
                                   new MethodCallExpressionArgs(){ IsMember=true, MemberName=AppendParameter(1)  }
                            }
diff --git a/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs b/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
index 833db234a..1f4c13a73 100644
--- a/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
@@ -96,6 +96,19 @@ namespace SqlSugar
     }
     public class PostgreSQLMethod : DefaultDbMethod, IDbMethods
     {
+        public override string IIF(MethodCallExpressionModel model)
+        {
+            var parameter = model.Args[0];
+            var parameter2 = model.Args[1];
+            var parameter3 = model.Args[2];
+            if (parameter.Type == UtilConstants.BoolType) 
+            {
+                parameter.MemberName = parameter.MemberName.ToString().Replace("=1", "=true");
+                parameter2.MemberName = false;
+                parameter3.MemberName = true;
+            }
+            return string.Format("( CASE  WHEN {0} THEN {1}  ELSE {2} END )", parameter.MemberName, parameter2.MemberName, parameter3.MemberName);
+        }
         public override string DateValue(MethodCallExpressionModel model)
         {
             var parameter = model.Args[0];