In this paper, a control method combined rectification angle adjustment and excitation control, which is based on phase-locked loop, is proposed to realize the feedback braking operation of the load commutated inverter fed synchronous motor. Firstly, the running state of the feedback motor driven by load commutated inverter is analyzed, and the problem of inverter angle adjustment in the feedback braking is described. After that, the method of implementing the feedback brake by the rectification angle and the excitation current control is put forward. Finally, the method proposed in this paper is simulated and experimentally verified. The result proves that the method is feasible.