The welding process qualification is mainly to determine the welding process characteristics,metal characteristics and process have a valid range of process parameters,to verify whether the obtained welded joints meet the standard requirements. The welding procedure qualification standard for the installation of nuclear island pipelines and equipment for the first pile of Hualong No. 1 nuclear power plant in China,the welding specification for mechanical equipment of pressurized water reactor nuclear power plant and the welding procedure qualification standard for M310 reactor nuclear power plant are "RCC-M Standard Volume IV S The practical application of "welding",this article analyzes the general requirements of the welding process specification and the welding process element covering rules,etc.,for the engineering technicians in the standard Give certain insights when using.