The recovery time of walking stiffness after six months of knee replacement varies from person to person, and the time may range from a few weeks to a few months. Reasonable and moderate functional training is needed to help patients return to normal walking as soon as possible. After knee replacement surgery, the general patients can walk normally in 3 months. For the elderly post-surgery patients, due to the deterioration of various aspects of the body, the recovery may be slower, or the functional exercise is not in place, resulting in incomplete recovery of the knee joint function, and symptoms such as stiffness in the knee joint when walking occur. When symptoms of knee stiffness occur, it is recommended to go to the hospital in time for a review to clarify the postoperative recovery situation, and carry out reasonable and moderate functional exercises under the guidance of the physician to help restore the normal mobility of the knee joint. However, there are individual differences in the recovery time, and the recovery time varies among patients with different physiques and conditions, so active treatment is sufficient.