under the guidance of the national policy of saving resources and protecting the environment, investment in environmental protection, as an important component of basic public services for the environment, provides support for effectively improving environmental pollution problems and promoting sustainable economic and social development.In this paper, the input-output index system is established from three dimensions of economy, society and environment. The three-stage DEA model is used to study the investment efficiency of environmental protection in 31 provinces, autonomous regions and municipalities directly under the central government in 2016. SFA regression analysis, the influence of environmental factors and random variables is removed, and the