I am a junior undergraduate student with speciality of physics in R. P. China. I am planning to have graduate study in US. I think that it will be of help to me if I can have undergraduate research experiences in American universities. On the one hand, I can show the American professors whether I am eligible for graduate study under their supervision. On the other hand, whether I really want to study physics in USA. Our summer vocation is during 2. July to 2. September. Yeah, it will be impossible for me to have salaries because I cannot obtain visa if this. However, is it possible for me to have summer research as a "free labor"?. I pay the air-ticket fees, I pay the rents and I pay for the food. etc.