diff --git a/Providers/FreeSql.Provider.Dameng/DamengExpression.cs b/Providers/FreeSql.Provider.Dameng/DamengExpression.cs
index 23ed1cedd..2ced154e1 100644
--- a/Providers/FreeSql.Provider.Dameng/DamengExpression.cs
+++ b/Providers/FreeSql.Provider.Dameng/DamengExpression.cs
@@ -389,11 +389,11 @@ namespace FreeSql.Dameng
             Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, tsc);
             switch (memberName)
             {
-                case "TotalDays": return $"(cast({getExp(date1)} as timestamp with time zone)-{getExp(date2)})";
-                case "TotalHours": return $"((cast({getExp(date1)} as timestamp with time zone)-{getExp(date2)})*24)";
-                case "TotalMilliseconds": return $"((cast({getExp(date1)} as timestamp with time zone)-{getExp(date2)})*{24 * 60 * 60 * 1000})";
-                case "TotalMinutes": return $"((cast({getExp(date1)} as timestamp with time zone)-{getExp(date2)})*{24 * 60})";
-                case "TotalSeconds": return $"((cast({getExp(date1)} as timestamp with time zone)-{getExp(date2)})*{24 * 60 * 60})";
+                case "TotalDays": return $"DATEDIFF(Day, {getExp(date2)}, {getExp(date1)})";
+                case "TotalHours": return $"DATEDIFF(Hour, {getExp(date2)}, {getExp(date1)})";
+                case "TotalMilliseconds": return $"DATEDIFF(MS, {getExp(date2)}, {getExp(date1)})";
+                case "TotalMinutes": return $"DATEDIFF(Minute, {getExp(date2)}, {getExp(date1)})";
+                case "TotalSeconds": return $"DATEDIFF(Second, {getExp(date2)}, {getExp(date1)})";
             }
             return null;
         }