The plate heat exchanger has the characteristics of high heat exchange efficiency, small material flow resistance loss, economical energy saving, compact structure, sensitive temperature control, large operation flexibility, convenient assembly and disassembly, long service life etc. It is the most advanced energy-saving heat exchange equipment in China. The heat exchanger is an important part of the heat station, which is the bridge between the heating primary network and the users, especially in the form of the development of centralized heating systems. With the wide application of heat exchangers, The hot system plays a decisive role. The heat exchange quality of the heat exchanger directly affects the heating quality of the residents. It is not uncommon for the low temperature and the shutdown of the heat exchanger due to improper maintenance of the heat exchanger. Therefore, effective measures must be taken to solve the operation and maintenance of the heat exchanger.