The ALT levels of all pregnant women enrolled were significantly higher at 6, 12 and 24 weeks postpartum than those of antepartum (P<0.05), postpartum hepatitis occurred in 36 cases, 22 cases occurred at 6 weeks postpartum, 12 at 12 weeks postpartum, 2 at 24 weeks postpartum. Here, GPT is linked to hepatitis A virus infection.