In this research, austenitic stainless steels 304 and 316 were welded by resistance spot welding (RSW), where the relationship between current, time and pressure variables was studied and their effect on the joint tensile strength and shear strength, as well as the hardness measurement and microstructure along the weld area has been considered, and effect of heat on penetration. By comparing the current and time values with the constant value of the pressure force, comparing the force and current values with the constant value of time, and comparing the current value with the constant values of the pressure force and the constant time. The results indicated that increasing the time and current gives the highest shear strength and tensile strength of the joint, but the lower pressure force gives the higher shear strength and tensile strength of the joint.