spoodie:
thanks your information.
I also find out which cause this!
It's SSH, we use F-secure SSH
and I usr putty as client.
I found if I using SSH, crontab -l User_ID will not works
but if I use telnet, it works normally
(same root, same putty)
so I think it SSH's problem.
but your information also helps me to more understand the solaris
thanks again.