During the braking process of disc brake,the contact stress field,friction temperature field,disc rotation angular velocity and energy change rapidly.The curved surface configuration of train brake was designed,and the brake structure was improved to make it suitable for carbon-ceramic friction material.Based on the direct thermal mechanical coupling finite element method,the simulation results of plane and curved surface brake structures were compared,and the temperature field distribution,contact stress distribution,angular velocity and energy time history curves of the two brake structures under the same working conditions were obtained.The results show that the braking efficiency of disc brake with curved surface is obviously higher than that of plane brake,but the distribution of temperature field and contact stress of the disc brake with curved surface is not good.