Artificial knee replacement is currently a very effective treatment for advanced arthritis, and its excellent results come from excellent surgical techniques and the patient’s own cooperation. In terms of the overall treatment process of knee replacement, rehabilitation is another important step to ensure the functional recovery of the knee joint after surgery, and its importance is no less than that of the surgery itself. Only by adhering to the rehabilitation exercises can the surgical effect be maintained and good function be obtained. The rehabilitation process is divided into two parts, one is pain management and wound care, and the other is knee function training. The former part is done by medical staff, and the latter part needs to be done under the guidance of doctors and rehabilitation instructors with the active cooperation of patients. Rehabilitation is generally categorized into active and passive exercise. Active exercise is when the patient contracts his/her own muscles and drives his/her limbs to improve muscle strength and stamina. Passive exercise is the joint movement assisted by the rehabilitation equipment or the rehabilitator. Active exercise is mainly to train muscle strength, while passive exercise is mainly to train joint mobility. As time goes by, we will gradually go down to the ground to practice walking and train the coordination of lower limb joints and muscles. Exercises gradually transitioned from walking frame to crutches, and then fully weight-bearing walking. Rehabilitation is indeed an arduous process, but also an encouraging process, patients will find that the preoperative joint pain will gradually disappear, joint function is gradually restored, and years of pain and suffering will see the light of day in just two weeks. Compared to this, I believe that every patient will be able to face the smallest pain.