The differential pressure of blood pressure is usually 30-40mmHg. If the differential pressure exceeds 50mmHg, it can be considered as atherosclerosis with poor vascular elasticity. In hypertensive patients, young people are mainly with high low pressure, normal blood pressure is 120/80mmHg, low pressure may be at 100mmHg or 95mmHg. elderly people are mainly with high systolic blood pressure, which can reach 160mmHg or 180mmHg, the pressure difference can reach 60mmHg, sometimes up to 70mmHg. blood pressure differential has a normal range value, when it is within the range, also More consideration is needed. When the blood pressure is elevated, it is necessary to consider whether the systolic or diastolic pressure is high and to clarify the reason for the increase in the differential pressure value.