In order to improve the accuracy of numerical simulation of CFRTP/stainless steel laser welding process, the thermal contact finite element model is established considering the influence of interface contact thermal conductivity on the welding temperature field.The temperature field was numerically simulated by ANSYS software. The influence of process parameters on weld width and temperature field was studied. The results show that the relative error of the weld width prediction value can be reduced from 17.8% of the traditional model to 6.7% using this model.It is closer to reality and can be used to guide test and industrial production.