International Conference on Computational Intelligence and Security (CIS) is a major annual international conference to bring together researchers, engineers, developers and practitioners from academia and industry working in all interdisciplinary areas of computational intelligence and information security to share the experience, and exchange and cross-fertilize ideas. Following the big successes of from CIS’2005 to CIS’2008, CIS’2009 serves as a forum for the dissemination of state-of-the-art research, development, and implementations of systems, technologies and applications in these two broad fields. CIS’2009 will be held in Beijing and co-organized by IEEE (Hong Kong) Computational Intelligence Chapter and Beijing Institute of Technology. Also, it is co-sponsored by Department of Computer Science at Hong Kong Baptist University, Guangdong University of Technology and Xidian University.