I found a solution finally and it is work 100%. This is help you to creating central bibliography for all documents and also mendeley sync your library automaticly.
First you have to locate your main MikTex file directory and "base" file. Mine is
C:\Program Files (x86)\MiKTeX 2.9\bibtex\bib\base
If you use windows 7 or later you definitelly set mendeley for working admin at all time.
Right click on mendeley shortcut or .exe and select properties. In the Properties box, select the Compatibility tab and then check “Run this program as an administrator”. It is done.
Second you have to set mendeley for creating "library.bib" in this location. It is simple open mendeley and go
tools > options > bibtex
click browse and set it for "base" file location.
Refresh your library or close and open mendeley. Make sure library.bib file is created in
C:\Program Files (x86)\MiKTeX 2.9\bibtex\bib\base
Last step go "MikTex settings(admin)"
Click "Refresh FNBD" and after click "Update Formats" button.
If you did everthing right it is definitelly work correctly.