Everyone applying for U.S. non-immigrant visas, including all visas granted for the purpose of U.S. study, is required to demonstrate an intention to return to their home country.
The burden of proof is on the applicant to prove ties to the home country and establish what is called non-immigrant intent.
During your student visa interview, you will be asked whether you intend to return to your home country after your education. We hope the answer is an honest yes. If so, you need to provide evidence to prove this.
Have a few sentences in mind that express how you intend to use your degree or research at home after your finish your program
Bring copies of deeds to any property (land, house, apartment, store, business) that you or your family owns in your home country
Bring bank statements for any accounts that you or your family maintain in your home country
If you have an employer who intends to employ you when you return home, bring a letter from that employer
For more information from the U.S. Department of State about the requirement to demonstrate ties to your home country click here
Also, for some good information and recommendations, we would suggest reading Ten Points.