Abstract: It is difficult to release residual stress for welding of austenitic stainless steel,therefore,its chlorine stress corrosion always occurs in engineering.The stress corrosion testing was done on different welding procedures of three different materials(304,316 L of China,and 304 of German).The welding procedure includes shielded metal arc welding and flux cored CO₂ shielded arc welding through air cooling and water cooling after welding.The base metal,starting point and ending point of welding arc were tested.The better procedure is obtained through 100 samples,and the stress-life relationship of stress corrosion in boiled MgCl₂ of two types of materials are formulated.The conclusion is that life of stress corrosion of 316 L is 15 times of 304,life of the starting point is longer than the ending point of welding arc,life of the butt weld is longer than the fillet weld,and faster cooling after welding is efficient for life of stress corrosion.