When microcirculation dysfunction or microcirculation blood perfusion decreases, nutrients and oxygen can not meet the needs of tissue oxidation and metabolism, and waste in tissues and organs can not be discharged in time, which may lead to organ dysfunction or failure, which is an important reason for the occurrence and development of many diseases. Modern medicine has proved that human aging, hypertension, diabetes and many cardiovascular and cerebrovascular diseases are closely related to microcirculation. Therefore, the normal function of microcirculation is an important sign of human health. The autonomic movement of capillary and heart is not synchronous, so the blood is perfused for the second time. Microcirculation also has this important physiological function, so it is compared to the "second heart" of human body in medicine.