Hypertension is a cardiovascular syndrome with elevated arterial pressure in the body circulation as the main clinical manifestation, and it is mainly divided into primary hypertension and secondary hypertension. Hypertension is one of the important risk factors for cardiovascular diseases, and long-term high blood pressure is likely to cause damage or even failure of the heart, brain and kidney organs. In the past, the diagnosis of hypertension required three blood pressure measurements on different days, and the diagnosis of hypertension cannot be based on one high blood pressure. Ambulatory blood pressure monitoring is a commonly used clinical tool to confirm the diagnosis of hypertension. This test automatically measures blood pressure every 30 minutes to an hour for 24 hours. A normal person’s blood pressure is bimodal, with two peaks between 6:00 a.m. and 10:00 a.m. and between 4:00 p.m. and 8:00 p.m. The lowest blood pressure of the day is between 2:00 a.m. and 3:00 a.m. The range of ambulatory blood pressure normal values differs somewhat from the range of manually measured normal values, and the criteria for diagnosing hypertension are also different. The latest new diagnostic criteria for hypertension proposed by the American College of Cardiology is greater than or equal to 130/80 mmHg. ambulatory blood pressure normal value range requires a 24-hour, average blood pressure should be less than 130/80 mmHg average blood pressure during the day is less than 135/85 mmHg, the average blood pressure at night should be less than 120/70 mmHg. ambulatory blood pressure monitoring can better exclude white The ambulatory blood pressure monitoring can better exclude white coat hypertension, postural hypertension and some emotional stress leading to a transient increase in blood pressure. Patients who have been diagnosed with primary hypertension must be actively treated with oral medications, and patients with secondary hypertension should be actively treated for the primary disease to keep the blood pressure under a stable state in order to better prevent hypertensive complications, improve the long-term prognosis of patients, reduce hospitalization rates, and improve survival rates.