Microchannel heat exchanger (MCHE) is a highly compact heat exchanger, whole body aluminum structure, the diameter of a single control refrigerant circulating about 1MM. Compared with conventional finned tube heat exchanger, MCHE using micro-sized heat transfer technology, smaller, lighter, heat rate increased by 50%, 50% less refrigerant charge fluence, fan power consumption is reduced accordingly. With rising raw material prices, air-conditioning product standards and environmental requirements continue to increase, microchannel heat exchanger is gradually replace traditional heat exchangers, and has been widely used in various fields, such as home air conditioning, commercial air conditioners, precision computer room air conditioners, heat pumps water heaters, refrigeration, air conditioning containers, train air conditioning, automotive air-conditioning and other fields.