Abstract: Nickel saving 7Ni cryogenic steel was welded by using Chinese ENiCrMo-6 electrode.The microstructure and impact fracture of the welded joint were observed and analyzed by applying OM, SEM and EDS methods.The tensile, cryogenic impact, bending and hardness of the welded joint were studied.The results show that the welding material matches well with the base metal, no welding defects are found in the welded joint, and the comprehensive mechanical properties of the joint meet the requirements of LNG engineering.The weld metal consists of Ni-rich austenite dendrites and precipitates, and the average hardness is 196.6 HV.There are some hard dilution layers at the interface of the fusion line, and the highest hardness is 405.2 HV.The heat affected zone is clearly composed of CGHAZ, FGHAZ and ICHAZ, and all the microstructure is martensite and a small amount of retained austenite.The average hardness of HAZ is 319.8 HV, which is higher than that of the base metal (233.1 HV).The average tensile strength of the joint is 726 MPa, and the fracture is located in the base metal.The average impact energy of the weld center, fusion line and HAZ is 82, 64 and 120 J at -196℃respectively.There are microcracks at the fusion line zone in side bending specimens.The hard and brittle microstructure near the fusion line is the main factor affecting the cryogenic impact toughness and bending performance of the joint.