Abstract:EcoSummit 2007 was successfully held in May 22-27 in Beijing with a theme of “Ecological complexity and sustainability: the opportunities and challenges of ecology faced by 21st century”. More than 1,400 delegates from over 70 countries and regions and 28 International/regional ecology-related organizations initiated or co-sponsored the summit. 13 plenary keynote speeches, 49 symposiums and 20 oral organized sessions were arranged. A Beijing Ecological Declaration has been adopted and disseminated world-wide with an accompanied title of “A World Role for Ecology: The Key to Life”. Ecology,a kind of natural philosophy, system science, engineering instrument and natural aesthetics in dealing with the relationship between Man and Nature, should be and must become the scientific basis for institutional reform, industrial transition, social/economic management, and overall decision making. The ultimate goal of understanding, simplification and transformation of complexity is to regulate, conserve and construct a sustainable “Village Earth”.