With　comprehensive　consideration　of　the　structure,　kinematics,　thermodynamics　problems　of　the　automotive　disc　brake,　a　time　model　of　brake　disk　in　Matlab,　a　structure　model　and　a　temperature　field　model　of　brake　disk　in　ANSYS　were　built,　and　the　multidisciplinary　optimization　analysis　and　design　could　be　made　by　numerical　analysis　and　calculation.　Integrating　iSIGHT　with　Matlab　and　ANSYS,　the　platform　and　simulation　processes　of　multidisciplinary　design　optimization　(MDO)　of　the　disk　brake　were　constructed.　In　order　to　achieve　the　parameters　extraction,　export　and　update　as　well　as　the　data　exchanges　between　the　software,　the　customized　development　of　the　software　has　been　made.　The　result　from　the　platform　test　demonstrated　that　the　braking　effect　was　improved,　the　braking　time　was　shortened　and　the　weight　of　the　brake　was　reduced.