Abstract: The stress corrosion cracking of 304SS weldments in NaCl solutions has been shudied by SSRT technique.It was found that there exists a critical temperature for the SCC in this system.The cirtical temperature decreases with the increase of NaCl concentration when the concentration of NaCl is lower than 1.0mol/L, but it doesn't change much in a wide range of NaCl concentration when the concentration of NaCl is higher than 1.0mol/L.The diagram of T(℃)-[Cl^-]-SCC has been given.For the weldment,SCC occurs in weld fusion zone and propagates along δ-ferrite phase between austenite dendrites.