1. Reasonable process design, in order to avoid the retention of liquid and sediment, double butt welding and continuous welding should be used, and lap welding and spot welding should be avoided. Because the plate is very thin and there is little welding wire added after welding melting, it is easy to cause bad weld shape, so welding wire should be filled in welding process to ensure good weld shape. 2. Reduce the erosivity of the medium, which has different effects on different corrosion systems, such as stress corrosion of Austenitic stainless steel in neutral chloride solutions, but as long as the mass concentration of oxygen in the medium is less than 1.3 mg / M3, no stress corrosion will occur. Therefore, stress corrosion can be controlled by removing dissolved oxygen and oxidants from the medium. Reducing the mass concentration of cl-and strictly controlling the mass concentration of sulfur in the medium are also effective measures to control stress corrosion. 3. electrochemical protection method, stress corrosion fracture is the process of anodic dissolution under stress. Therefore, it can be controlled by electrochemical protection. Stress Corrosion cracking (SCC) of metals and alloys is related to potential. In some systems, there exists a critical rupture potential above which a SCC will occur. More systems have a sensitive potential range, which is usually in the passivation activation region. The metal potential can be removed from this sensitive potential range by electrochemical polarization. The electrochemical protection method can not only prevent the stress corrosion fracture, but also stop the crack propagation even if the protective parameters are selected properly. Good results can sometimes be obtained by means of sacrificial anode protection or surface spraying of corrosion-resistant metals. 4. Reduce the residual stress. According to the actual experience, the main stress causing stress corrosion cracking is the residual stress, and the residual stress is mainly composed of the internal stress caused by cold working and welding. The heat treatment of cold work-piece and welding-piece is helpful to eliminate the residual stress and prevent the stress corrosion.