Selection of prosthesis mainly consider the following factors: 1, the economic situation: patients can be based on their actual economic situation, choose the prosthesis suitable for their price, the same price can be a variety of options. 2, living environment and activity: this case should focus on choosing durable prosthetic parts, and then consider the functionality of the prosthetic parts, such as the ankle joint can choose to move the ankle or universal ankle and so on. 3, weight and height: each kind of prosthetic fittings it has suitable for the crowd, imported fittings are labeled with adaptive weight standards, inaccurate selection will reduce the function of the prosthesis and service life; the body is too high patients should choose the higher safety performance of the prosthetic fittings. 4, gender and age: the elderly and female patients have a smaller range of motion and small amount of movement, should choose a higher safety performance of the prosthesis; young people should choose the flexibility and functionality of the prosthesis. 5, residual limb conditions: the residual limb is too short, the surface has a scar implantation and poor surgical residual limb, will affect the normal function of the prosthesis; residual limb conditions are good patients, can control the prosthesis well, walking naturally.