The chiller plate heat exchanger is a high-efficiency and compact heat exchange device. It has a higher heat transfer coefficient than other heat exchangers. Due to the many advantages of the plate heat exchanger itself and the excellent heat transfer performance, It is widely used in the fields of chemical industry, air conditioning, domestic hot water, heatingetc., but it has a fatal flaw and a large flow resistance. This defect seriously hinders the further popularization and application of the plate heat exchanger. There are many flow channels between the plates of the plate heat exchanger, and the heat exchange is carried out through the plates. Compared with the conventional heat exchanger, the heat transfer coefficient is doubled or even higher under the same flow resistance. For the internal structural characteristics of the plate type heat exchanger, the heat exchange and flow characteristics in the heat exchanger passage can be studied by a numerical simulation method.