In the clutch engagement process, ablation and thermal deformation will occur when the pressure plate friction temperature is too high. Three-dimensional finite element model was established by using abaqus simulation software, and coupled simulation of thermal structure was conducted by direct coupling method combined with the actual working condition of the plate. The temperature field and stress field of the plate are obtained, and the influence of the sliding speed, pressure and thickness of the plate on the temperature field and stress field is studied. At the same time, the structure of pressure plate is optimized for warping deformation, and the inner cone angle is added to the sliding surface. The results show that the high rotational speed difference will increase the friction temperature and stress of the pressure plate, the friction area of the pressure plate moves towards the inner diameter, and the warping deformation becomes more serious. The increase of pressure also increases the friction temperature and stress, but has little effect on the friction contact. The increase of the pressure plate thickness can increase the heat capacity of the pressure plate, and also make the temperature and stress more concentrated. Increasing the cone angle in the pressure plate can improve the temperature and stress distribution of the sliding surface of the pressure plate significantly, the maximum value drops by 11.8% and 5.4% respectively, the effective contact area increases, and the working performance and stability of the clutch are improved.