When visiting the clinic, there are many patients who have high blood pressure measured in the clinic, but when they go home to measure it, it is not high anymore, and they are hesitant to take medication or not, in clinical practice, there is a type of hypertension called “white coat hypertension”, because the sight of a white coat makes them nervous and causes their blood pressure to rise. This type of hypertension is not true hypertension and does not require medication. Many patients ask whether the blood pressure measured at home is accurate or not, and whether they can trust it. In fact, in 2012, China published the “Chinese Expert Consensus on Home Blood Pressure Monitoring”, which provides a detailed explanation of home blood pressure monitoring methods, home blood pressure diagnostic criteria, the clinical application of home blood pressure, and the relationship between home blood pressure monitoring and ambulatory blood pressure monitoring. 1, home blood pressure monitoring method Recommend the use of upper-arm electronic sphygmomanometer, measurement before sitting in a chair with a backrest rest for 5 minutes before starting to measure blood pressure. When measuring blood pressure, place the upper arm with the cuff on the table, at the same level as the heart, with both legs relaxed and on the ground. Blood pressure should be measured 2-3 times a day in the morning and 3 times a day in the evening, with an interval of 1 to 2 minutes, and then the average value should be taken. In the morning, it should be taken within a few hours after waking up and before taking antihypertensive medication; measure blood pressure before breakfast; take a sitting position when measuring; and empty the bladder before taking the pressure. Evening measurements can be taken after dinner or before bedtime, as long as the time of measurement is fixed each day. 2, home blood pressure diagnostic criteria China’s home blood pressure monitoring expert consensus recommends that home blood pressure ≥ 135/85 mm Hg can be diagnosed as hypertension, <130/80 mm Hg for normal blood pressure. 3, the clinical application of home blood pressure home blood pressure monitoring can be "white coat hypertension" and part of the "occult hypertension" for differential diagnosis, can partially replace the function of ambulatory blood pressure monitoring. Adherence to home blood pressure monitoring is the only way to monitor the effectiveness of antihypertensive therapy in the long term. Through home blood pressure monitoring, patients can communicate with their treating physicians about their blood pressure control, find out the reasons for uncontrolled or low blood pressure, make effective lifestyle interventions, or adjust the dosage of antihypertensive drugs. This effectively improves the quality of antihypertensive treatment and reduces long-term variability of blood pressure.