Liver function tests in late pregnancy are mainly to screen for diseases that affect liver function abnormalities. Abnormal liver function in late pregnancy predicts some idiopathic diseases, such as viral hepatitis, intrahepatic cholestasis and acute fatty liver. Viral hepatitis in late pregnancy can increase the incidence of preeclampsia, easy postpartum hemorrhage, and increase the perinatal mortality rate; intrahepatic cholestasis in pregnancy is a unique complication in the middle and late stages of pregnancy, with symptoms such as jaundice, itching of the skin, and in severe cases, it is necessary to discontinue the pregnancy; acute fatty liver disease occurs in the late stages of pregnancy, with coagulation dysfunction, and is prone to postpartum hemorrhage, etc. Most of these diseases have a rapid onset, and the condition is very serious, with a high risk of postpartum hemorrhage. Most of these diseases have a rapid onset and rapid progression, and liver function tests help to predict their occurrence in order to cope with them. Therefore, it is necessary to have regular checkups in late pregnancy to protect the lives of pregnant women and perinatal babies.