This paper analyzes the typical welding technical problems in the design and construction process of VVER PWR nuclear power plant from China to Russia,and puts forward the process and measures to solve the problems of uncertain classification of materials supplied by Russia,materials supplied by China,materials and base metals from the third country,which cannot determine the welding process materials for evaluation. The process and measures for assessing problems,providing solutions and experience feedback for the treatment of defects in equipment and materials in the welding process in Russia,and suggestions for rectification of difficult construction techniques that lack welding processes and welding qualifications,and effectively implemented rectification methods can promote Sino-Russian technology conversion and the progress of project construction.