The rehabilitation training of posterior cruciate ligament lies in the fact that the knee cannot be moved too much, the knee cannot be stretched too early, and the knee cannot be fixed in the position of flexion at an early stage. 1. Can not move the knee too much: in the process of rehabilitation of posterior cruciate ligament injury can not move the knee too much, otherwise it is easy to affect the recovery of the ligament, and even lead to re-injury. 2. Can’t stretch the knee too early: when recovering from posterior cruciate ligament injury, usually can’t stretch the knee violently, otherwise it will easily lead to ligament injury aggravation, such as the phenomenon of ligament obvious tear. 3. Early can not fix the knee in the position of flexion: in the early stage of posterior cruciate ligament injury can not be fixed in the position of flexion of the knee, otherwise it is easy to lead to local soft tissue adhesion, thus affecting the range of motion of the knee in the later stage. In the early stage of posterior cruciate ligament injury, attention should be paid to braking and resting, and in the later stage, under the guidance of the rehabilitation physician, gradual exercise should be carried out to prevent the after-effects.