The monitor is a part of the closed-circuit monitoring system (cctv). It is the display part of the monitoring system and the standard output of the monitoring system. Only with the display of the monitor can we watch the images sent by the front end. As an indispensable terminal equipment for video surveillance, it serves as the “eye” of the monitoring personnel, and also plays a key role in hindsight inspection. The main function of the monitor is to display the monitoring picture, which is needed in monitoring, medical treatment and film and television production. The monitor is different in different places. The monitor for film and television production is generally expensive, and can be used for pre-shooting and post-output to monitor the effect.