JZ-8 type brake control system was introduced, including the project origin, system structure, main functions, working principle, braking mode, system software, test verification, and loading application. The important components of the brake control system were described in detail, such as the functions of the brake controller, the action of the brake screen, the modular features of the brake control cabinet, and the function principle, function and architecture of the BCU module of the core control unit. The system software architecture was described in detail according to the function module. The laboratory test and test curve of the system, on-line loading test and so on was introduced too, which proved the braking system could meet the requirements of the brake performance for AC drive locomotive.