When we leave USA they don't take for us I-94 form. That is problem or no. please answer me.?

Yep.... That is a big problem. You can be shot on sight if you ever try to reenter.

The CBP's advice on this topic, essentially, is that the original I-94 should be sent to:

ACS, Inc.

1084 South Laurel Road

London, Kentucky 40744

This must be transmitted with proof of departure. Suggested proof includes the arrival stamp in one's passport and the boarding pass from the flight. Of course, it is vital to keep copies of any documents submitted. The CBP warns that, without proof of the departure, there is no guarantee that the information will be entered into their system.

This is logical, since otherwise, people could send the documentation and claim departure when none occurred or claim departure on a different date.

i am assuming you have not left the US yet?

it is a problem if you do not have the form when leaving the US,if you ever want to come back.

http://www.foreignborn.com/visas_imm/entering_us/9...