As the first choice for efficient and compact heat exchange equipment, plate heat exchangers have been widely used in industry. China's plate heat exchangers are mostly used in industries such as centralized heating, sulfuric acid and alkali production in food, light industry, machinery and civil buildings, and have achieved good results. The working environment of the marine plate heat exchanger is a very demanding dynamic environment: (1) It may encounter vibration, shock, large angle tilt and noise. (2) The cooling medium is generally seawater, with a high concentration of salt, high working environment humidity and strong corrosiveness. (3) Ships have strict restrictions on the space and quality of plate heat exchangers.