30 weeks pregnant low pressure is a little high, need to be under the guidance of the doctor dynamic observation, if necessary, need medication sedation, antihypertensive treatment. Low pressure refers to diastolic blood pressure, 30 weeks pregnant low pressure is a little high but not more than 90mmHg, can be appropriate rest and dynamic observation. However, when the same arm measurement at least 2 times diastolic blood pressure ≥ 90mmHg, need to rest first, if necessary, can be given sedation drug treatment. When the blood pressure is still high, it is necessary to follow the doctor’s advice to give labetalol, nifedipine and other drugs to reduce blood pressure treatment. The use of specific drugs need to be under the guidance of the doctor. Measurement of blood pressure during pregnancy should be carried out in every obstetric examination, which can detect blood pressure abnormalities at an early stage, especially for pregnant women with high-risk factors, such as obesity and a history of hypertension in a previous pregnancy. When hypertension in pregnancy is clearly diagnosed in the clinic, it is necessary to strengthen the management of pregnancy, actively control blood pressure, and appropriately shorten the duration of the labor and delivery checkup to avoid serious complications such as eclampsia and cardiovascular and cerebrovascular accidents.