Blood pressure pump promotes blood return to prevent hypotension, relieves muscle ischemia and prevents thrombosis by squeezing muscles and blood vessels. 1. The blood pressure pump is pressurized by inflation and depressurized by deflation, realizing the extrusion of the lower limbs from the distal to the proximal end of the heart, which produces a similar effect of muscle extrusion, promotes blood reflux, improves the volume of the lower limbs returned to the heart, stimulates the sympathetic neural activation of the lower limbs, and reduces the incidence of hypotension. 2. For post-surgery, cerebral nervous system disease long-term bed-ridden patients, pregnant women, etc., mobility is not easy, the blood flow in the lower limbs is slow, easy to form thrombus, blocking the blood vessels of the lower limbs, resulting in ischemia of the organism, the gradient pressure of the blood pressure pump can accelerate the blood flow rate, preventing the formation of deep vein thrombosis in the lower limbs. Blood pressure pumps should be used reasonably under the guidance of a doctor, and should not be used on their own.