thank you Terry. I tested this ,but it didn't work. when I set the field format in field property dialog ,set the format to numeric ,and check the negtiv option, the value display always like (322.000)、(23.0000)、（333.000）,could give me some advice on how to make it always two decimal.like (3333.00) 、（33.00)、 （33333.00). thank you.