Hey, I want to begin my carrier as a private pilot. Please advice me about the all body requirements for a private pilot. Such as my height, weight. And if other required. Will u.s government will assure me visa easily if I wish to join any aviation campus there . And what is hour system , I mean how it is related to a pilot, what actually it mean.

Tough question to answer because you are missing so much, but I'll try as best I can.
There is no career position called "private pilot". A private pilot license by definition prevents the pilot from flying commercially (that's commercially, not Air Lines, a different category).
I'm guessing from your post that you think being a candidate for becoming a pilot in the US would help you immigrate. No - not even a factor.
There are many other issues, but these are show stoppers.
If you get beyond those, to become a pilot in any country in the world, there are many factors - height and weight perhaps being important - but spacial perception, hand-eye coordination, mental attitude, ability to act under pressure, etc. being extremely important.
If you REALLY want to be a pilot, your best chance is to check on the requirements in your own country and apply for training programs there. --
There is no shortage of candidates in the US.
I am, by the way, a licensed commercial pilot (not Airline) who used to be a military combat pilot. So, I do know a little about this.
I don't want to discourage you, but I recommend that you look at what you really want to do and you feel you can do it.
The answer to this isn't, "I really want to be a pilot and I think I could be one in the US." Do some research, try to understand what a pilot is and what he needs to do from a job perspective, from a skill perspective, etc.
After you think about these things, if you have more questions, I am willing to try to help answer them. --- Realize that there is a very small percentage of the population of the world who have the physical skills and the mental aquity and quickness to become a pilot.

Hi I believe that you want to be a commercial pilot and the first step towards it is a private pilot's license. To be a civil pilot you should be average 5' of height, eyes correctable to 6/6 should be mentally fit and no major health related problems. Now I believe the hour system is like this- [I] people requirements total hours 40 out of which 10 hrs of solo flight time, out of the 10 hrs solo you should have 5 hrs of cross country and so on. No one can guarantee a u.s. visa it depends case to case you can find more about it on Google

Gleim Publications :: Private Pilot Requirements (http://www.gleim.com/aviation/ltf/private_requirements.php)
I would get this book:
http://www.gleim.com/products/productdetails.php?proID=6822

Go to faa.gov... look under pilots and training. There you can read and download everything you need to know about obtaining FAA Airman cetificates and ratings.

EJ