Hi

Some one delete my data in sever 2003, how can know which user delete my data

Unless you are on a network system which backs-up all movements on it,you can't.

If a file is deleted on a personal computer,there are no tracks left,once the system is rebooted all leftover information s gone(at least on mine it is,mine deletes and cleans the files/folders/cookies,etc on shut down.)