I just looked at your site and you don't even have the option on for user's to change styles. Go to AdminCP > Settings > Options > Style & Language Options > Allow Users to Change Styles > Yes.

Yea , I know about that , but I mean for admin , If i want to choose an other style is still redicerting me to Themes..

Lynee told you how to fix this. The Admin confirms to this rule just like all the users

yea but for admin should to work without to be enable for choose all users

I'm not sure about vb5, but it doesn't on vb4. Admin can select disabled themes, but not if User select is completely disabled.

Let me explain to you If i want to choose a style from admin account , it redirecting me to themes , not to style

You are going to have to provide screenshots.
in vBulletin there are no Themes, there are Styles.

There are Themes , I think from folder , so when I want to choose like default style , it redirecting me to Themes folder

In your AdminCP -> Style Manager you have a style called "Themes" which has several children, and because the parent has a smaller "Display Order" value than any of the others, it is being listed first. Other users will only see the two styles you have checked.

Yea , but when i want to choose an other style is redirecting me to Themes :)You can check ,