The large transport aircraft has high requirement to the safety and comfort level of passengers,and automatic brake control system has become an urgent needed system.An automatic brake control system applicable for large transport aircrafts is presented in the paper.The scheme and architecture of the system are given,and analysis is made to the working principle of the system.The system control logic is put forward,and the control law based on the constant reduction rate is studied.Computer simulation was carried out.A dynamic system test was made to the automatic brake control system on an inertial test bench,and the test results achieved the expected objectives.