>sorry~
>i want to ask if i don't pass anything into the para. #2, and #3
>and i just pass the command that i want to run.....
>but the return value still 0 ..........
>what can i do?

I have no idea - that indicates that the command could not be run, usually a sign that something is wrong with your command line or DOS path. You've provided no details, making it impossible to even take a guess.