is Belorussia same as Russia? Belorussia is different language or it is secondary language in Russia. what is the main difference between these two languages.

No, Belorussia is a completely different country. But it used to be a former Soviet Union Republic though. A lot of people speak Russian there too.
So these two languages are alike with some differences in spelling and pronunciation.

okey, is Belorussia other country and speaks Belorussia language ? both countries sounds with same name except two letters more for Belorussia. may be Belorussia more closer place to Russia and do people in Belorussia speaks Russia ?

Its not belorussia language, it is russian language but have differences in spelling and pronunciation.
its like chinese language. Chinese have have about 30 dialect like shanghaihua, guangzhouhua etc., but about 75% speaks at putonghua.

No, excuse me, but you are wrong.
There is belorussian language. It's a relative to russian language, and it's very close to it, but it's not a dialect, it is separate language.
"It belongs to the group of the East Slavonic languages, and shares many grammatical and lexical features with other members of the group"
(http://en.wikipedia.org/wiki/Belarusian_language)