In traditional video surveillance applications, the traditional needs are "watching, controlling, storing, querying, and displaying". However, with the development of security technology, especially the transition from analog monitoring to network monitoring, the limitations of regional closed monitoring have been broken, making it a reality for provincial, municipal, and county level networking. In the evolution of this industry, it has prompted the security industry to quickly digest and absorb the IP technology of the IT industry and introduce it into video surveillance.

The application of video surveillance technology in the field of public security has a long history and is the main technology for solving cases. It can provide timely and accurate videos, images, and massive video surveillance data for public security personnel, helping them find the target person more quickly. In recent years, with the deepening of smart public security construction, the use of monitoring technology to promote the standardization of public security law enforcement has played an increasingly important role.

　　（1） Investigation and control

Beneficial for video surveillance technology, the public security department has established a video surveillance network covering key areas, key locations, and key places, as well as a security checkpoint system on important roads. It has also set up a three-level networked video surveillance center at the provincial, municipal, and county (district) levels, realizing the "resource sharing, interconnection and mutual control" and "one point deployment, corresponding to the entire network" of the province's video surveillance system. This has achieved the goal of dynamically controlling social security and cracking down on illegal activities, building a new type of social security prevention and control system, and comprehensively enhancing the public security organs' ability to prevent, control, crack down on, and maintain stability in emergencies. The network set up through video surveillance systems has become a major tool for public security organs to investigate and solve cases. Video surveillance technology has become the fourth major technology for public security organs to investigate and solve cases after criminal technology, action technology, and online investigation technology.

　　（2） Judicial Trial

Currently, video surveillance technology plays an important role in public security interrogation work. From the moment * arrived at the law enforcement and case management center, it entered the video surveillance area. Surveillance cameras are installed in the corridors of the case center, as well as in the waiting rooms, interrogation rooms, and interrogation rooms needed during the case handling process. The entire process of handling cases has no blind spots, and illegal activities such as torture to extract confessions and individual interrogation have been eliminated. *After entering the real identity in the case handling area, a smart wristband will be worn to bind personal information, case information, movement trajectory within the case handling area, and all audio and video information to the smart wristband. In response to the problem of non-standard law enforcement behavior in grassroots law enforcement and case handling, all interrogations must be recorded throughout the process, and the work of police officers will be strictly supervised. Under a complete monitoring system, problems such as forced confessions by torture will not occur, and police officers will not be falsely accused.

　　（3） Emergency Command

With the continuous expansion of the construction scale of social security dynamic video surveillance systems, in addition to public security, the role of video surveillance in large-scale event security, group event handling, major accident handling, and other aspects is becoming increasingly evident.

At the same time, video surveillance technology, as an important force in security systems, plays an irreplaceable role in improving the comprehensive capabilities of disaster prevention, emergency response, safety production, and emergency management. In the disaster prevention and emergency industry, video surveillance technology has various application methods and wide uses, adding assistance to the construction of a three-dimensional prevention and control system.