The blood pressure of pregnant women during pregnancy is normal within 140/90 mmHg, and above this value is considered high. However, according to the basis of onset and the degree of organ damage, it is often seen in the following four conditions: 1. Hypertension in pregnancy: blood pressure ≥ 140/90 mmHg, first detected during pregnancy, and blood pressure returns to normal within 12 weeks after delivery. Such patients do not require special treatment, rest, sedation, monitoring the status of mother and child; 2, pre-eclampsia: mild patients with blood pressure ≥ 140/90mmHg, severe ≥ 160/110mmHg. such patients should be prevented from convulsions, indicated hypotension, diuresis, sedation, close monitoring of the mother and fetus, prevention and treatment of serious complications, timely termination of pregnancy, etc.; 3, pregnancy combined with chronic Hypertension: pre-existing hypertension, systolic blood pressure ≥ 140 mmHg and/or diastolic blood pressure ≥ 90 mmHg found before 20 weeks of pregnancy, or hypertension first diagnosed after 20 weeks of pregnancy and continued until 12 weeks postpartum, such pregnant women are mainly treated with antihypertensive therapy; 4, chronic hypertension complicated by preeclampsia: refers to chronic hypertensive pregnant women without proteinuria before pregnancy, proteinuria appeared after 20 weeks of pregnancy, or 4. Chronic hypertension complicated by preeclampsia: pregnant women with chronic hypertension have no proteinuria before pregnancy, but proteinuria appears after 20 weeks of pregnancy, or proteinuria before pregnancy and proteinuria after pregnancy increases significantly, which may be accompanied by serious manifestations such as renal impairment, pulmonary edema, neurological abnormalities or visual impairment.