As we all know, security video surveillance system is an important part of security technology defense system. It is an advanced and highly capable comprehensive system. Its features are as follows: (1) Visual, intuitive, specific and vivid, which can not only monitor a wide range, but also enlarge and watch the small details of interest; (2) Large amount of image information, "seeing is better than hearing", "a picture is like a thousand words", good real-time performance, and has the ability of active detection; (3) Rich information resources, high-definition images, suitable for image processing, recognition and intellectualization; (4) Through the remote control camera and its auxiliary equipment (lens, PTZ, etc.), you can directly watch all the conditions of the monitored place (image, sound, etc.) in the monitoring center, which has a large amount of information and high accuracy; (5) It can be linked with other security technology prevention systems such as anti-theft, fire alarm and access control, so as to make the prevention ability more powerful, accurate, safe and reliable alarm; (6) The image and sound of the monitored place can be recorded in whole or in part. It can not only record the state of the event, but also record the development process and disposal results of the event. The recorded information is the most complete and true. Therefore, it can be used as evidence and provide basis for subsequent investigation; (7) Rich information resources can be used not only as security applications, but also as non security applications in industry, agriculture and commerce; (8) One machine has multiple functions, such as monitoring, speed measurement, flow statistics, disaster and dangerous situation prediction, etc. At present, the video monitoring system has developed from analog to digital, networked and integrated, and is moving in the direction of high definition and integration. At that time, the security video monitoring system can pre alarm / alarm in advance, prevent the accident, and truly ensure safety.