The treatment of high blood pressure in the second trimester is as follows: 1. rest for at least 10 hours a day, maintain sedation, do not restrict the amount of salt and fluids for pregnant women with less severe edema, but restrict the amount of salt for pregnant women with severe edema; 2. for pregnant women with blood pressure > 160/100mmHg or with previous chronic hypertension combined with pregnancy and taking antihypertensive drugs, take oral antihypertensive drugs to lower blood pressure; 3. pregnant women with pulmonary edema and heart failure can use diuretics; 4. pregnant women with hypoproteinemia can be infused with albumin and plasma; 5. choose the timing and mode of pregnancy termination according to the condition of the pregnant woman.