The plate heat exchanger is an efficient and compact heat exchange equipment. The continuous low temperature sterilizer was successfully developed in the 1880s and was applied to the food industry in the 1920s. Because plate heat exchangers have some unique features in their manufacture and use. Therefore, plate heat exchangers have been used in petroleum, chemical, light industry, electric power, metallurgy, machinery, energy and other industrial fields. China has been producing plate heat exchangers since the 1960s. So far, plate heat exchangers have been applied in many fields in China.