In this paper, the thermal effect of laser welding is studied by ANSYS software combined with experiments under the environment of uneven mechanical properties. The stress field of laser cladding and laser induction composite cladding is simulated by ANSYS, and the stress can be reduced by 3/4; the laser induction composite cladding can improve the cladding efficiency to a certain extent, because of the induction, it will slow down the laser area cooling. However, with the increase of temperature, the heat affected zone becomes larger and the cladding speed is accelerated. After induction, with the cooling process, the highest temperature appears in the center of the workpiece, not in the cladding layer. The reason is that the final cooling here results in the generation of compressive stress, which can be obtained by solving the stress field. Compared with the measured temperature curve, the simulated temperature curve has good consistency with the measured temperature curve when the temperature range of the infrared temperature monitoring system is 400~1 200 ℃. Compared with pure laser, when the temperature is higher than 500 ℃, the existence time of laser induced composite cladding pool is significantly longer, which extends from 1.5 s to more than 60 s, which significantly alleviates the severe cooling and heating. In the depth direction, the stress distribution has a certain regularity, and the linear expansion coefficient is different due to the difference of cladding layer and base material. With the increase of depth, the stress decreases. According to the distribution of temperature field, the center of the workpiece is the last cooling part.