After reviewing the development of energy-saving construction and green buildings in China,the author suggests that in order to develop low carbon cities in China,efforts should be put into both green buildings construction and low carbon ecologic city development.The paper divides the low-carbon ecologic cities into four categories and summarizes the experiences gained from the ecologic city development in Sino-Singapore Ecologic City in Tianjin and Caofeidian in Tangshan.In addition,it also introduces the general idea for low carbon city development in China and the particular requirements for the planning and construction,as well as the critical techniques for low carbon ecologic city development. After reviewing the development of energy-saving construction and green buildings in China, the author suggests that in order to develop low carbon cities in China, efforts should be put into both green buildings construction and low carbon ecologic city development. The paper divides the low -carbon ecologic cities into four categories and summarizes the experiences gained from the ecologic city development in Sino-Singapore Ecologic City in Tianjin and Caofeidian in Tangshan. addition, it also introduces the general idea for low carbon city development in China and the particular requirements for the planning and construction, as well as the critical techniques for low carbon ecologic city development.