Abstract: In this paper,the connection mechanism of parallel gap resistance welding was introduced,that is,good interface bonding was mainly achieved by solid phase diffusion,and the influence law of contact resistance was discussed. The distribution of temperature field and stress-strain field in the welding process of wire/sheet and sheet/sheet was emphatically introduced,and the influence of welding parameters such as welding voltage,welding time,electrode pressure and electrode spacing on the welding quality was described in combination with test and simulation results. Finally,the application prospect of parallel gap resistance welding was prospected,and the direction of simulation research was discussed.