The plate heat exchanger is a new type of high efficiency heat exchanger which is assembled from a series of metal sheets with a certain corrugated shape. Plate heat exchangers are usually assembled from thin plates. A wide variety, such as: sealed, welded, spiral plate, shell and shell. It has many advantages such as high heat transfer efficiency, light weight, small floor space and easy maintenance. The design of the plate heat exchanger mainly includes heat transfer design and frame structure design. The heat transfer design is mainly based on the medium and working conditions to determine the type of the plate heat exchanger and the type of the plate and the flow mode of the medium. The key to determine the type of the plate is the calculation of the total heat transfer coefficient K value; the frame structure design is according to the nature of the medium, the size of the plate and related materials, design the dimensions and materials of the fixed compression plate, movable compression plate, upper and lower guide rods, clamping studs etc., and check the parts trength and stability according to relevant standards.