I'm not an English-speaking native, but your post does not make much sense (looks like an online translation maybe). I suspect you will have to come up with a better description of your problem in order to get help.
If you mean eZ Publish forum, then it is rather impossible. Like any other type of content, forum structure is stored and managed with dedicated content engine, which actually is the heart of this CMS. There aren't separate dedicated scripts for different content types, this is what makes eZ Publish different from other systems, you may want to read a bit about basics: http://ez.no/doc/ez_publish/technical_manual/4_0/concepts_and_basics
I agree that if you need only a forum, ez publish might be overkill. It provides a lot of functionality that you would not be using.
That being said, if you wanted to use ezpublish you could delete all of the other content except for the forum content, and you would be left with just a forum. There is one (forum) installed in the eZ Web Interface package.
thinking, that forum script better more from others what i see, what work with: mysql, sqlite, oracle.
i like http://zakal.org.ua/forum/.
some days ago i scan script, than find vulnerability. like that script
I see you're referring to a Ukrainian website, so I suppose you speak Russian as well. Maybe you can post your questions in on the Russian eZ Publish community forum at http://www.ezpublish.ru,t it might be easier for you to talk in one of your native languages. Good luck!
Я вижу, вы ссылаетесь на украинский вебсайт, поэтому предполагаю, что вы говорите по-русски. Возможно, вам лучше обратиться с вопросами на форум русского eZ Publish комьюнити (http://www.ezpublish.ru), так как вам будет проще общаться на родном языке. Удачи!