how i stop it?!
 

i give to some member admin on one forum and he take all threads and he Combination all threads in him forum
how i can back them?!
and hoe i stop Combination for admin usergroup?
thx!

First, disable his admin.
After give him ban, to IP, email and user.
For last, you have to transform all the threads back.
Or, import a backup.

is 350 threads :S
but if i give to other someone admin and he can do it too
how i stop it option that Combination ?
thx!

To stop it from happening go to

Admincp -> Users -> Search For Users
and remove the member admin. If your just going to give access to your admincp to anyone then you can expect this to happen.