The plate heat exchanger plate is specially used for the plate heat exchanger to isolate the medium and exchange heat. It is an important part of the plate type heat exchanger. The quality of the plate heat exchanger plate affects the overall performance and working conditions of the heat exchanger.In order to solve the chloride stress corrosion of general Cr-Ni stainless steel, it is very important to select materials reasonably. According to the results of the study on the temperature of the stainless steel at different temperatures, the applied stress of 18 MPa, the Cl- content and the cracking time, it can be known that when the Cl- is 50 ppm, the crack is difficult to occur, so it is recommended to be limited to 50 ppm. That is, when Cl- ≤ 50ppm, water temperature ≤ 130℃ can be used 304 stainless steel; water temperature > 130℃ using 316 stainless steel. If the water temperature is >130 ℃ and Cl - >50ppm, then titanium can be considered.