The body is very beneficial to exercise often. However, incorrect methods, incorrect exercise methods bring harm to the body, such as excessive exercise will appear body knee pain, the specific methods are as follows: 1. reduce the amount of exercise. 2. relax the legs. 3. use ice packs. 4. flexion and extension exercises. 5. do functional training to stabilize the knee joint. 6. perform small half squat training. 7. massage the knee joint. 8. keep the knee warm. 9. wear sports brace. 10. The following are possible causes of knee pain after exercise: long periods of inactivity, incorrect posture, inadequate warm-up, muscle strain on the patellofemoral joint.13 The specific ways to prevent knee pain after exercise are as follows: warm-up exercises should be adequate, choose the right sports shoes, grasp the right amount of exercise, master exercise techniques, and start with low-intensity exercise. The exercise starts with low intensity. The above methods, along with treatment according to the specific situation will make the knee pain to recover.