High pressure i.e. systolic pressure and low pressure i.e. diastolic pressure, differential pressure index i.e. pulse pressure is 30~40mmHg is optimal. Under normal circumstances, the index of diastolic blood pressure is 60~89mmHg, and the normal index of systolic blood pressure is 90~139mmHg. The pulse pressure is between 30~40mmHg, 20~30mmHg and 50~60mmHg are called the critical value, if it is lower than 20mmHg, then it is considered to be the pulse pressure is on the low side, and the pressure difference is more than 60mmHg, then it is considered to be the pulse pressure is too big, all of which are abnormal. normal. However, for most young patients, the elasticity of blood vessels is relatively good, and the pulse pressure difference between systolic and diastolic pressure will be smaller. However, if it is less than 20 mmHg, consider pericarditis or pericardial effusion, and be alert for hypotension as an adverse effect. Increased pulse pressure is common in diseases such as aortic valve insufficiency and atherosclerosis. Too large or too small pulse pressure is an abnormal reaction, need to pay attention to, and actively go to the hospital for relevant examination to analyze the cause of the disease, and then according to the doctor’s instructions for targeted treatment.