Abstract: Objective To explore hepatitis B vaccination rate in Beijing adult population aged over 18 years and factors affecting the vaccination rate for hepatitis B control and prevention.Methods A multistage randomized cluster sampling was carried out in Beijing adult population aged over 18 years.A sample of 4449 adults was recruited and the hepatitis B immunization history and risk factors for all subjects were investigated with a questionnaire.Results The hepatitis B vaccination rate was 8.4%(95% confidence intervalCI=7.6%-9.2%) and the complete vaccination rate was 84.2% (95%CI=96.7%-84.7%).The vaccination rate was different between males and females,rural and urban inhabitants,age groups,occupation,education levels and income leve ls(P<0.05).With the increase of age,the vaccination rate decreased(P<0.05).The vaccination rate of the medical personnel was 44.0% and the close contact population was only 15.1%.The main reason for the non-vaccinated population was "Donot know the place of vaccination".Conclusion The effect of hepatitis B vaccination policy in medical personnel is obvious.More attention should be paid to the closecontact population of hepatitis B patients.Meantime,hepatitis B vaccination policy in high risk adultpopulation should be intensified.