According to the welding characteristics of Z2 CND17-12 stainless steel,Z2 CND17-12 stainless steel was welded by automatic pulse TIG welding. The welded joints were tested by the tensile test,impulse test,bending test and microstructure analysis. The results show that all the performances of the welded joint is much higher than the requirements in the standard of the RCC-M volume Ⅳ. Pulse multilayer multipass welding is adopted for welding,and the welding heat input is small,so the microstructure in the upper of weld zone is mainly dendritic δ-ferrite,the microstructure in the center of weld zone is mainly vermicular and dendritic δ-ferrite,and the microstructure in the lower of weld zone is mainly network δ-ferrite. There is no obvious change in the HAZ grain and significant microstructure.