The CPM Limb Intelligence Movement Training Aid, abbreviated as CPM machine, is designed based on the range of motion of human limbs. It is mainly used to meet the needs of bedridden patients for full-range passive movements of the upper and lower limbs during the preoperative and postoperative recovery periods. It belongs to a type of physical exercise therapy. This equipment usually consists of power supply, motor, control board and transmission mechanism as its main components, simulating human joints to perform repetitive stretching and extension movements. It can be used for the early intervention of joint stiffness, pain, muscle atrophy, and tendon-ligament adhesion in bedridden patients to prevent limited joint movement or promote functional recovery. The equipment has functions such as speed adjustment, timing, and angle adjustment. The main unit is composed of an operation panel, control unit, motor and transmission mechanism, along with accessories such as braces, fixation seats, and straps.