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.