Journal of Multimedia Processing and Technologies Julio C. Rivera , Paul M. Di Gangi , James L. Worrell , Samuel C. Thompson , Allen C. Johnston 6 4 2015 At present WEB application server especially image server lacks of effective methods of anomaly diagnosis. Therefore, this paper presents the method of anomaly diagnosis based on the dendritic cells algorithm of Danger Theory. The method can achieve the purpose of monitoring system status effectively by building a multi-layer indicator system. Experiments prove that the application of the dendritic cells algorithm to anomaly diagnosis in image server is effective.