Daily blood pressure monitoring of hypertensive patients has important significance. The following are some of the precautions that are usually taken when self-testing blood pressure at home: 1, the choice of home sphygmomanometer Priority is given to recommend the upper arm type electronic sphygmomanometer, which has the advantage of better accuracy and repeatability, and easy to grasp and use. Pay attention to the purchase of regular manufacturers of sphygmomanometers. Poor economic conditions can consider the choice of mercury sphygmomanometer. The use of wrist-type electronic sphygmomanometer is not recommended. 2, before measuring blood pressure, you should rest at least 5-10 minutes in a quiet state. Try not to hold urine. Avoid exercising, smoking, drinking coffee and strong tea. 3.The blood pressure can be measured in a lying or sitting position. When measuring in a sitting position, keep the center of the arm band at the same level as the heart, with the lower edge 2~3 cm from the elbow fossa, and the cuff elasticity so that it can fit into one finger, not too tight or too loose. The thickness of the clothes should be no more than a single layer of autumn clothes. 4. It is recommended that blood pressure be measured at least 2-3 times a day, and that the frequency of monitoring be increased for individual blood pressure fluctuations and poor control to guide the adjustment of medication. Each measurement 2 to 3 times each, with an interval of 1 to 2 minutes, and take the average record. When you do the above, the measured data will be real and reliable to have reference value.