Civil air defense, physical defense and technical defense. "In 2020, the national public security organs and the education department carried out the special action of" protecting schools and protecting parks "in depth, which achieved a decline in criminal cases involving schools for eight consecutive years and the security situation on campus continued to improve." On the occasion of the 26th National Day of Safety Education for Primary and Secondary School Students (March 29th), the Ministry of Public Security held a press conference on March 26th to inform the deployment of public security organs throughout the country to fully safeguard the campus and students' safety, crack down on illegal crimes committed by school-related students according to law, and create a good environment for students' safe and healthy growth. The construction of "three defenses" (civil air defense, physical defense and technical defense) on campus is an important foundation and guarantee for campus safety. Zhang, deputy director of the Public Security Administration of the Ministry of Public Security, said that starting from 20 19, the Ministry of Public Security and the Ministry of Education jointly launched a three-year national action plan for safety precautions in primary and secondary schools. By June 2024 1, 98% of primary and secondary schools in China have implemented closed management, 9 1% are equipped with full-time security guards, 90% are equipped with one-button alarm and video surveillance systems, and 94% of urban primary and secondary schools and 92% of urban primary and secondary schools have "School Wei Gang".