Abstract: The bracket-cable system composed of axial grounding cable, grounding terminal, bracket and wire splint of B-type metro vehicle is studied. The structural characteristics of the component fracture problem are systematically analyzed, the structure and component distribution are optimized from aspects such as bracket structure and cable fixing method. Based on the modal analysis and harmonic response analysis of the bracket-cable system, the maximum amplitude point of the cable is studied, and the fixing method of the cable is optimized. After optimization, the natural frequency of the system is improved and the resonance of bracket-cable system with wheel-rail and axle box is possibly avoided, thereby improving the service life of the components.