Perimeter intrusion alarm system is one of the important components of all kinds of park security systems. Its reasonable application of perimeter intrusion alarm technology can reduce engineering costs, improve performance, improve security efficiency, which is conducive to building a safe, harmonious, open and orderly social management and service. Based on practical engineering experience, this paper summarizes the technical characteristics and business points of the mainstream perimeter intrusion alarm technology in engineering application, and puts forward some suggestions on technology selection in engineering application, hoping to provide some references for the management, design and implementation personnel of perimeter intrusion alarm engineering, so as to select the most appropriate perimeter intrusion alarm technology.