This paper gives introduction to the requirements set by environmental protection courts for environmental public-interest litigations，and analyzes the significant breakthroughs and remaining regrets for experimental cases of environmental public-interest litigations in terms of defining principal part qualification and environmental public interest，application and precautionary principle，and polluter pays principle （PPP）. Furthermore，this paper discusses the current obstacles in the development course of environmental public-interest litigations as well as the outlook of strategies and directions for lodging environmental public-interest lawsuits in the future.