Urban forest is an important part of urban ecosystem. To understand and quantify its benefits is an important prerequisite to make maximum use of the benefits. This article puts forward an coo--benefits assessment process of urban forest from qualitative analysis to quantitative analysis. It introduces the coo-benefits research and modeling functions of CITYgreen model developed by the Administration of American Forestry, and summarizes the applications of this model in and out of the country. Finally, it discusses the parameter...