Abstract: In order to evaluate the coverage of HB vaccine,the data of the third 85% national immunization coverage reiew was analyzed.Among the children born in 1994,the full immunization(3 doses) coverage of HB vaccine was,on the average,50.6%(with 95% confidence interval between 50.4% and 50.8%).It was shown that the coverage of HB vaccine was different in different provinces.The coverage was higher than 85% in 7 provinces,50-84% in 8 provinces and 30-50% in 7 provinces.There were 13 provinces in which the coverage was higher than the average 50.6%.The coverage was 91.3% in urban area and 44.6% in rural area (P<0.00001).In order to identify the factors which influence the coverage,multiple logistic regression analysis was used.It was shown that the following factors might be related to the higher coverage:urban area,plain area,population hoding immunization insurance contract,having immuniztion cards and the basic knowledge of diseases prevention in caretakers.