In order to ensure that the surveillance camera can work normally in harsh environments such as outdoor high, low temperature, wind and sand, heavy rain, ice and snow weather. Normally, it will use various types of protective covers to extend the working life. The protective cover must be able to protect the camera and lens from pollution by dust and corrosive gases. Then, the protective cover should be equipped with heating plate. Commonly used are PI polyimide heating sheets and silicone heating sheets. These heating sheets are thin and soft, can be customized according to the shape of need, and can be installed near the lens without blocking the lens use. The silicone/polyimide heating mat plays an important role in a low temperature environment heating, which can increase the internal temperature of the protective cover, and ensure that the lens works normally.