Dynamic blood pressure monitoring is an automatic non-invasive, box-type, portable and easy-to-carry device for detecting dynamic blood pressure through a set programmed electronic timer and computerized device, which has the advantages of being safe and inexpensive, easy to use and so on. Ambulatory blood pressure monitoring can truly reflect the blood pressure status at each time point, the characteristics of blood pressure fluctuation in hypertensive patients and the pattern of diurnal and nocturnal changes, which can help to screen critical hypertension and mild hypertension, identify white coat hypertension, and foretell the degree of damage to the target organs, and it can also better evaluate the efficacy of antihypertensive drugs, and guide the reasonable antihypertensive treatment. The ambulatory blood pressure monitor can store the blood pressure and heart rate records at regular intervals, and the monitoring value can be automatically deleted if it exceeds the valid measurement range, and then supplemented with measurements, and this threshold can be automatically recognized as invalid if the value is still out of the reading range when it is re-measured for 2 times. During the period of ambulatory blood pressure monitoring, the patient’s life pattern should be the same as before. When using ambulatory blood pressure monitoring, at least 14 measurements are taken during the daytime and at least 7 measurements are taken during the nighttime, usually between 9-21 p.m. during the daytime and between 1-6 p.m. during the nighttime. For the measurements of patients who have the habit of taking a nap, the blood pressure in the napping period is also very important.