UAV swarm can be launched from surface,aerial and underwater platform.It becomes a new threat to warship because of its characteristics such as huge quantity,cooperative search,coordinated path planning,intelligent recognition and precise strike ability.This paper puts forward a technique of UAV swarm defense based on shipborne UAV swarm.An operational simulation system was developed to analyze hostile UAV swarm defense achieved by traditional shipborne weapons or shipborne UAV swarm of a single warship.Results show that the defense effectiveness of shipborne UAV swarm is significantly superior to traditional weapons while defensing a huge amount of UAV swarm.Defense effectiveness of shipborne UAV swarm increases with the hit rate of shipborne UAV if the hostile UAV swarm can be detected at long distance.If not,it increases with the hit rate of shipborne UAV as well as the system reaction speed and launch speed of UAV launcher.