It is generally recommended to measure the blood pressure in the morning or in a quiet state, which is more accurate, and the correct measurement of blood pressure can help to understand the patient’s condition and guide the clinical treatment. Blood pressure refers to the amount of pressure exerted on the walls of blood vessels during the flow of blood through the vessels. Normal blood pressure is not fixed, but generally fluctuates in a diurnal rhythm. Since blood pressure can be affected by exercise, emotion, body position and other factors, it is generally recommended to measure blood pressure more accurately when waking up in the morning or in a quiet state when the blood pressure level is not disturbed by external factors. Before measuring blood pressure, the sphygmomanometer should be calibrated and standardized measurement methods should be mastered, such as using the appropriate cuff, keeping the cuff at the same height as the heart, deflating slowly, and reading horizontally. Moreover, measuring blood pressure at the same time every day, fixing the body position and using the same sphygmomanometer as much as possible are more beneficial to understand the fluctuation of blood pressure dynamically. Correct measurement of blood pressure helps to understand the patient’s blood pressure changes in a timely manner, which can be used to adjust the treatment program and guide the clinical use of medication.