Research On Efficiency Of Environmental Protection Input Based On Three-stage DEA Model In China

China’s economic development under the new normal has gradually slowed down in recent years,but environmental problems are still severe.It is imperative to seek the harmonious development of the economy and the environment.Therefore,in recent years,China has continuously increased investment of human capital and material resources in environmental protection.However,even if the investment is rising,the current status of environmental pollution is still not optimistic.Different provinces and cities have regional differences in their economic development structure,environmental protection policies,scientific and technological level,the degree of pollution is also different.Thus,while analyzing the factors of regional differences,it is also of utmost significance to scientifically and effectively evaluate the comprehensive efficiency of investment in environmental protection.What is the actual efficiency of China’s investment in environmental protection? How to analyze the efficiency based on factors of regional differences? How to formulate specific investment strategies of environmental protection to promote the coordinated development of the regional economy and the environment? In order to solve these problems and provide a basis for further effective allocation of environmental protection resources,this paper establishes a rational,standardized and systematic evaluation system of environmental protection index.With the use of three-stage DEA model and the consideration of the impact of environmental and random factors,the author evaluates and analyzes the efficiency of investment in environmental protection in 30 provinces(except Tibet),expounds the actual efficiency in different regions,In order to fully understand China’s environmental protection investment efficiency.Besides,through the comparison of the efficiency in eastern,middle,western,and northeast region,this paper puts forwards plans to optimize the investment in environmental protection as well as provides strong theoretical support for government departments and local environmental protection agencies to formulate environmental protection policies.Based on DEA model of three stages,we find that although environmental protection input has increased year by year,the effect of output has not been ideal.Low efficiency of environmental protection input causes the volume of pollutant discharged to increase significantly and continually,and numerous investments can not play a due role.The results show that:(1)Pure technical efficiency and scale efficiency are changed while random factors and environmental factors are excluded;(2)The efficiency of environmental protection investment in different regions varies widely;(3)The proportion of the second industry in GDP is the negative factor of the efficiency of environmental protection input.Per capita disposable income,energy conservation and environmental protection expenditure,education level are favorable factors for environmental protection input.Finally,according to the research results and considering the local economic development and investment in environmental protection of different regions,suggestions for improving the investment efficiency are proposed.First,the regulatory capacity of the local government on special funds for environmental protection and its responsibilities shall be strengthened,and improve the ability of environmental protection staff.Second,the government makes more investment in capital and technology according to the shortcomings of the region,and gives full play to the regional economies of scale to promote the strategic adjustment and structure optimization of the environmental protection industry.Third,innovation of the reform on environmental protection mechanism shall be made with improvement in environmental protection policies and more preferential measures to propel the development of environmental protection industry,and raise awareness of environmental protection.Fourth,innovation and application of environmental protection technologies shall be promoted,on the one hand promote green production is necessary,and on the other hand we should strengthen and guide the application of the Internet + to innovate environmental protection and develop new momentum.