I have a website for doing business. And for this purpose I need to make a Business Profile for my website. But I do not know how can I make it ? Can anyone tell me or provide me sample of a business profile ?

Who is asking for the "Business Profile".

Generally speaking, a "business profile" is a sentence describing your business.

Ya I know That........................

But I want to know about the formal rules for describing about my business.........

There ARE no "formal rules" for what you ask. It all depends on who's asking. You "tweak" your "business profile" to suit whomever you're submitting it to.