Normally, the body’s blood pressure fluctuates in a pattern throughout the day, with two peak periods occurring. The first peak occurs between 6am and 10am, and the second peak occurs around 4pm (also known as 3pm to 5pm). Of these, the first peak period is when the body’s blood pressure is at its highest. For hypertensive patients, since blood pressure is highest during these two peak periods, especially the first peak period, cardiovascular and cerebrovascular diseases are often prone to occur at this stage. Therefore, for hypertensive patients, it is important to actively control these two peaks of blood pressure. Generally, antihypertensive drugs are taken one hour before the peak of blood pressure, so that the peak of blood pressure can be controlled and the purpose of smooth control of blood pressure can be achieved. For hypertensive patients, there is a special situation, that is, the blood pressure fluctuation pattern does not follow this law, but there is a low elevation of blood pressure at night, this time should be taken once before bedtime antihypertensive drugs to control high blood pressure at night. To understand the fluctuation pattern of blood pressure, it can be clarified by 24-hour ambulatory blood pressure examination. Especially for hypertensive patients, clarifying the pattern of blood pressure fluctuation is more conducive to guiding the use of medication.