Study on 38 pregnant women last 3 months with HBsAg (+), pregnancy management and delivery at Thai Nguyen National Hospital from 4/2017 to 10/2017 was shown that. Prevalence of log10 HBV DNA <2 copies / ml was 23.7%, log10 HBV DNA from 2 - 5 copies / ml was 28, 6%, log10 HBV DNA> 5 copies / ml was 47.4% HBeAg (+) / HBsAg (+) is 47.4%.