what is the procedure to get admission in American universities from Pakistan? I mean for Pakistani students? please describe thoroughly?

Since there are over 3000 colleges & universities in the US, you need to start your research by buying a copy of a good general guidebook. E.g. Barron's Guide to US Colleges & Universities is well known & widely available. There are thousands of books available on amazon, etc, detailing info on schools & how to apply, TOEFL exam preparation guides, SAT & ACT exam preparation guides, even books on how to write a good personal essay for college admissions.

First, average cost of 4-year bachelor's degree in US for Americans is USD250,000. Foreign students always have expenses citizens do not incur. The minimum is going to be proof of at least USD50,000/year to apply for a student visa, IF you are accepted by one of the lower-cost schools in a low-cost area of the US. For more expensive schools in high-cost cities, foreign students are burning through as much as USD100,000/year! If you & your parents don't have that kind of cash, investments, etc, available for your education expenses + return transportation to your country of citizenship, don't waste $5000 or so on expenses to apply for admission (application fees, test preparation & testing fees, transcript fees & official translations, independent evaluation of high school transcripts such as WES, etc.).

You also need to do research online. NO way to provide so much info in a short post! That's why there are thousands of books written on the subject!

There are 3000 colleges and universities in the US. Many of them will accept you. However, you must prove to the US Government that you have enough money to pay for a years education ahead of time. It is unlikely that you have the 50K so I doubt that you will be able to get a visa even though you would be accepted to a university. If you are from a rich family and can afford to go, then just look on the website of any university which will tell you how to apply.

There are thousands of universities in the U.S. Since you give no information on what you want to study at what level, just Google for universities that have the courses you want to study, pick one and go to their website and check their requirements for International students. If you don t have enough money to pay $50,000.00 US dollars per school year, there isn't much point in looking.