The so-called extracorporeal force source control of the upper limb prosthesis refers to the use of human external force source as the power of the upper limb prosthesis, it is in order to overcome the mechanical upper limb prosthesis with traction belt maneuvering inconvenient and difficult to install, drawing on the results of modern high-tech, especially electronic technology and human bionic results came into being. Extracorporeal force source control of the upper limb prosthesis and its own force source control of the prosthesis compared with many advantages: First; wearing their own force source prosthesis patients to complete the elbow flexion and extension as well as hand grip function need to spend a lot of energy and a lot of time to learn and use the control of the traction cord. Manipulating the movement of the prosthesis by traction is not only uncomfortable for the patient, but it also consumes too much of the patient’s energy. Secondly, the movement of the prosthesis controlled by its own force source is not only dependent on the movement of the residual limb, but is also accomplished by the coordinated movement of the upper body, shoulder or chest. Therefore, its use is limited by the shoulder, elbow joints, as well as some muscles and physical conditions of the upper body. The upper limb prosthesis controlled by extracorporeal force source, mainly through the switch, valve or the use of electronic control signals to achieve the function of the prosthesis, so it only requires the patient to use a small amount of muscle power in the extracorporeal force source of energy to achieve the purpose of controlling the prosthesis movement, although it also requires a learning process, but compared to their own power to control the prosthetic limb is much simpler and more convenient. In terms of the classification of extracorporeal force source, we can be divided into: electric prosthesis, pneumatic prosthesis according to the source of control. Among them, the pneumatic prosthesis because of the large size, too heavy, practicalization is more and more difficult, while the electric prosthesis has been widely used. The electric prosthesis can be divided into two categories according to its control mode: the electric hand controlled by micro-switch and the electromechanical hand controlled by myoelectric signal.