From May 29thto 31st, the 2009 System Science, Management Science and System Dynamics International Conference was held in Tongji University. More than 110 scholars from Chinese mainland, Taiwan, Macao, US, Canada, Australia, Italy and other countries and regions held 7 meetings and 8 groups statement in2 and a half days. They made in-depth discussion and academic exchange about system science theory, management science theory and practice, system dynamic theory and application, complex system theory and sustainable development.