It is helpful for doctors to diagnose hypertension, and it can provide blood pressure level and change rule at special time, which has important reference value for doctors to diagnose hypertension early. It can help doctors eliminate this kind of false hypertension, help to identify white coat hypertension, provide authentic blood pressure information in daily life, and help doctors diagnose white coat hypertension. It is helpful to monitor the treatment effect and observe the complications and emergency treatment.