The gimbal is a supporting device for installing and fixing cameras, which is divided into two types: fixed and electric gimbal. Fixed gimbal is suitable for situations where the monitoring range is not large. After installing the camera on the fixed gimbal, the horizontal and vertical angles of the camera can be adjusted. Once the best working posture is achieved, simply lock the adjustment mechanism. Electric pan tilt zoom is suitable for scanning and monitoring a large area, and it can expand the monitoring range of the camera. The high-speed attitude of the electric gimbal is achieved by two executive motors, which receive signals from the controller to accurately operate and position. Under the control signal, the camera on the gimbal can automatically scan the monitoring area and track the monitored object under the manipulation of the monitoring center duty personnel.