The behavior of cheating in examinations has grown into gang crime, showing the characteristics of networking, collectivization and industrialization, which makes it difficult to detect cheating by existing anti cheating equipments. To combat radio cheating, a simple and effective radio cheating prevention and control system is studied, integrating the application of the advanced monitoring and recognition technology, the adaptive directional jamming technology and the portable full-band cell domain signal shielding technology, and the effective block of sending answers to exam room is eventually realized, reaching the goal of preventing radio cheating. Gradually it helps to form a prevention and control network system covering most examination-room areas throughout Beijing. Through systems design and implementation, monitoring equipment and jamming equipment and others are effective, and it has improved the efficiency of examination.