Abstract: Based on the unified visco plastic An and constitutive equation,the nonlinear finite element method is applied to study the influence of the temperature range,the ramp and the length of a well time and holding time on stress distribution and plastic strain in Sn63Pb37 soldered joint.Also the plastic-strain-based Coffiin-Masson equation is used to analyze the thermal cycling test efficiency and relation of these parameters.The results provide valuable guidance to determine the most efficient temperature profile of the thermal cycling.