TejKhadkaji, This is how I got financial aid in the form of RA (Research Assistantship) when i came to US for my graduate Studies. First go through few universitiies's web sites to see the research areas of the various professors. Find the ones whose research interests match yours. Then apply to those universities. After you apply, contact the professors for the financial aid. You have to tell them what you have done in that research filed before. Then the admission section informs you about your admission with or without financial aid. Generally without financial aid unless you have a strong publication record. If the admission section does not provide you financial aid, then you have to ask the professors (whom you have contacted earlier) for RA/TA. In my case, immediately after I got the admission decision from the department, I contacted a professor who reviewed my background and offered me RA. And generally your RA will be renewed each year if you preform satisfactorily in your research.