To define main factors relate HBV&HCV prevalence as sharing syringes and needles, sharing acupuncture tool and sharing tooth-brushMethodology: Using cross-sectional study among population aged 15 - 60, random sampling with multi-stages in 2 districts in Hanoi and BacgiangResult: HBV & HCV prevalence in Hanoi, Bacgiang is 8% and 2.7%.