With funding from the Global Fund project, Vietnam Authorized of HIV/AIDS Control and National Institute of Hygiene and Epidemiology conducted intergrated survey on behavior with the sampling method in HIV/STI sentinel surveillance among the highrisk groups to answer key questions on risk behaviors and coverage of the intervention program helps to provide timely information for policy makers. In the Northern region, the survey was carried out on about 300 sex workers in province in 06 provinces of Son La, Phu Tho, Vinh Phuc, Ninh Binh, Ha Nam and Hung Yen.