Industrial camera is a key component in the machine vision system. Its most essential function is to convert the optical signal into the ordered electrical signal of the small-size high-definition industrial camera. In the machine vision system, the lens of the industrial camera are equivalent to the eyes of human beings. Its main function is to focus the targeted optical images on the photo surface of the image sensor (industrial camera). All image information of the visual system treatment can be obtained from the lens of industrial camera. The lens quality of the industrial camera will directly affect the entire performance of the visual system. As an image device, the lens of industrial camera usually constitute a complete image collecting system with the power source and camera. Therefore, the lens selection of the industrial camera is restrained by the entire system requirement. Generally, it can be analyzed and considered as the following aspects.