For patients with cervical spinal cord injury, loss of hand function is one of the prevalent functional impairments. The conventional clinical treatment is surgical management of spinal cord injury, rehabilitation, complication prevention treatment, etc. The restoration of spinal cord nerve function is crucial for patients. However, there is still very little hope for the recovery of spinal cord function in patients with complete spinal cord injury; many patients are still tetraplegic after long-term rehabilitation, their ability to grasp things with both hands cannot be improved, they need to be fed by their family members to eat, and their ability to take care of themselves is very poor. At this point, the patient’s spinal cord function no longer continues to recover, and the rehabilitation treatment enters a bottleneck period of stagnation, and any conservative treatment measures seem to have little effect. In this case, the intervention of functional reconstruction techniques is needed. In patients with cervical spinal cord injury, there is often a part of the tendon that can be transferred. After transferring these tendons, the original function is usually not affected, and after being carefully designed and transferred to the intended location, this part of the tendon can perform the function of making a fist, holding and pinching objects, which can improve the patient’s function by a large step and achieve a peculiar therapeutic effect, which is a clinical progress in spinal cord nerve function reconstruction. The necessary conditions for tendon transfer hand function reconstruction: first, there is a qualified tendon available for transfer; second, there is no stiffness in the joint; third, the hand has good sensory function; fourth, the patient can break the traditional concept, not stick to the rules, accept the surgical treatment, and the psychological state is good, and actively cooperate with the surgery. Fifth, they can actively cooperate with functional exercise. According to the research results of hand function reconstruction of spinal cord injury in recent years, the best period for hand function reconstruction is about one year after spinal cord injury, too old spinal cord injury often puts patients in a state of metacarpophalangeal and interphalangeal joint stiffness and serious muscle atrophy, at which time, even surgery will not obtain satisfactory clinical results. Figure 1 Muscle atrophy in the right hand between the large and small pisiform muscles after cervical 6 spinal cord injury, complete loss of hand flexion wrist flexion finger flexion thumb function, and inability to make a fist and hold objects in the right hand. Figure 2 Tendon transfer hand functional reconstruction in Figure 3 Application of plaster external fixation for 6 weeks after surgery Figure 4 Functional exercise started after 6 weeks of plaster external fixation Figure 5 Right hand fist clenching 2 months after surgery Figure 6 Right hand grip strength device exercise 2 months after surgery