diff --git a/Src/Asp.Net/PgSqlTest/Demo/Demo1_Queryable.cs b/Src/Asp.Net/PgSqlTest/Demo/Demo1_Queryable.cs
index 66ea8c0eb..66c0c5028 100644
--- a/Src/Asp.Net/PgSqlTest/Demo/Demo1_Queryable.cs
+++ b/Src/Asp.Net/PgSqlTest/Demo/Demo1_Queryable.cs
@@ -177,7 +177,8 @@ namespace OrmTest
 
             var  list4 = db.Queryable<ABMapping>()
               .Mapper(it => it.A, it => it.AId)
-              .Mapper(it => it.B, it => it.BId).ToList();
+              .Mapper(it => it.B, it => it.BId)
+              .Where(it => it.A.Id == 1).ToList();
 
             //Manual mode
             var result = db.Queryable<OrderInfo>().Take(10).Select<ViewOrder>().Mapper((itemModel, cache) =>
diff --git a/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs b/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs
index a933f2323..eb42f8256 100644
--- a/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs
@@ -45,6 +45,11 @@ namespace SqlSugar
         }
         public override string GetTranslationColumnName(string propertyName)
         {
+            if (propertyName.Contains(".")&& !propertyName.Contains(SqlTranslationLeft)) 
+            {
+                return string.Join(".", propertyName.Split('.').Select(it => $"{SqlTranslationLeft}{it.ToLower(isAutoToLower)}{SqlTranslationRight}"));
+            }
+
             if (propertyName.Contains(SqlTranslationLeft)) return propertyName;
             else
                 return SqlTranslationLeft + propertyName.ToLower(isAutoToLower) + SqlTranslationRight;
diff --git a/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Demo/Demo1_Queryable.cs b/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Demo/Demo1_Queryable.cs
index 3113645c2..431b16edb 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Demo/Demo1_Queryable.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/PgSqlTest/Demo/Demo1_Queryable.cs
@@ -168,7 +168,8 @@ namespace OrmTest
 
             var  list4 = db.Queryable<ABMapping>()
               .Mapper(it => it.A, it => it.AId)
-              .Mapper(it => it.B, it => it.BId).ToList();
+              .Mapper(it => it.B, it => it.BId)
+              .Where(it=>it.A.Id==1).ToList();
 
             //Manual mode
             var result = db.Queryable<OrderInfo>().Take(10).Select<ViewOrder>().Mapper((itemModel, cache) =>
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs
index a933f2323..eb42f8256 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLBuilder.cs
@@ -45,6 +45,11 @@ namespace SqlSugar
         }
         public override string GetTranslationColumnName(string propertyName)
         {
+            if (propertyName.Contains(".")&& !propertyName.Contains(SqlTranslationLeft)) 
+            {
+                return string.Join(".", propertyName.Split('.').Select(it => $"{SqlTranslationLeft}{it.ToLower(isAutoToLower)}{SqlTranslationRight}"));
+            }
+
             if (propertyName.Contains(SqlTranslationLeft)) return propertyName;
             else
                 return SqlTranslationLeft + propertyName.ToLower(isAutoToLower) + SqlTranslationRight;