At present, the rapid development of wireless network has brought great convenience to people's life. With the rise of short video, the transmission speed of messages is faster and faster. However, convenient communication contributed to large-scale illegal gathering events. At first, there were not many people gathered, and the mood of on-site personnel was not very intense. With the passage of time, many people contacted the outside world through telephone or mobile network. In addition, with the increase of on-site onlookers over time, the mood of personnel was very easy to be incited, and the scene became difficult to control. It also brings many new challenges to the police disposal work. At this time, the application of vehicle jammer is essential. Controlling the on-site communication signal can effectively reduce the gathering of personnel and shorten the residence time of on-site personnel, which is of great benefit to the disposal of the police. Reduce the rapid spread of false information and cause social unrest.