In recent years, PRISM and other security incidents have aroused worldwide attention to security issues, the structure of in- telligent cooperative network is complex, security issues are more prominent. At present, most of the researches on intelligent coop- erative network focus on resource dynamic matching, intelligent service matching and so on, but few researches focus on security de- fense technology in intelligent cooperative network. This paper analyzes the security defense technology in the intelligent coopera- tive network, and analyzes the packet detection and flow detection technologies against DDos attack in the intelligent cooperative network.