24-hour ambulatory blood pressure monitoring is an important item in clinical hypertension examination, it is through the use of ambulatory blood pressure monitor automatic timed measurement of blood pressure, can be set to measure the blood pressure at certain intervals, can be set to measure the blood pressure automatically every 15-30 minutes for 1 time, set the number of times of the blood pressure measurement during the day is more, set the number of times of the blood pressure measurement during the night is less, and continuously monitor for 24 hours. Through 24-hour ambulatory blood pressure monitoring, the patient’s 24-hour blood pressure fluctuation pattern can be found. Through 24-hour ambulatory blood pressure monitoring, it is possible to diagnose white coat hypertension, detect hidden hypertension, check for the presence of persistent hypertension, assess the degree of elevation of the patient’s blood pressure, the presence of short-term variability in blood pressure as well as to decide on the duration of taking antihypertensive drugs, and evaluate the effectiveness of antihypertensive treatment.