Ecological regionalization is abase for rational management and sustainable utilization of ecosystem sand natural resources. It can provide scientific basis for constructing healthy ecological environments and making policies ofenvironmentalmanagement. In this paper, based on syntheticalanalysis of the characteristics of ecological environments of China, the principles of ecological regionalization are discussed, and indices and nomenclature of ecological regionalization are proposed, The ecoregions in national scale are divided. The results show that there are 3 domains, 13 ecoregions and 57 ecodistricts.