Patellar abrasion is chondromalacia patella, the rehabilitation training is mainly quadriceps muscle strength training and joint mobility training. 1. Quadriceps muscle strength training: the quadriceps muscle strength can be strengthened by straight leg raising, increasing resistance and squatting against the wall. 2. Knee mobility training: mainly includes knee flexion and extension training and lateral ligament stretching training. Before starting the rehabilitation, first of all, we should reduce the acute phase symptoms through appropriate rest, braking and other emergency measures, in addition, we can cooperate with the ultrashort wave, electrotherapy and other auxiliary rehabilitation treatment. For those with severe pain, ibuprofen and diclofenac can be used to alleviate the symptoms and prevent further aggravation of wear and tear of the patellar cartilage. It is also necessary to avoid activities such as sedentary, long-distance walking, bicycling and going up and down stairs to increase knee injury in daily life. It is recommended that patients should go to the hospital in time to avoid complications such as swelling and pain in the knee joint during training, so as not to miss the condition.