The plate heat exchanger is a new type of high efficiency heat exchanger which is assembled by a series of metal sheets with a certain corrugated shape. Plate heat exchangers are used to treat liquids from water to high viscosity for heating, cooling, condensation and evaporation. It is the most widely used in the food industry for heat sterilization and cooling of milk, juice, glucose, beer, vegetable and oil. Used as cooling ammonia in the chemical industry. Condensing methanol vapor. It cools synthetic resins and is widely used in the alkali, acid and fuel industries. It used in the steel and machinery manufacturing industries to cool quenching oils, water and lubricants. In the power industry, cooling water for cooling transformer oil and cooling dual-water internal cooling generator sets. Others use such as shipbuilding, oil drilling, paper, pharmaceutical, textile industry, building heating, heating systems also began to widely use plate heat exchangers.