Hi
I have 2 templates in my website one for the main page and the other for special pages.
I used k2 with two templates components but when I show k2 item it always display in the default template.
I tried to change the template for k2 category from category item layout but the list of select the template don't display the templates, there is one option (Use Default) shown in this list.
Please help me, How can I show K2 item in the non default template.

In order to show a different Joomla! template (not K2 sub-template) you need to map that instance ( item or category if you want it to appear in multiple items ) into a menu item.
Then in that menu item you can set the different Joomla! template.

Thanks

You 're welcome Jori.