According to the new connotation of ecology and environmental protection industry,this paper applies quantitative input-output method to form an approach from medium industry to macro-economic effects.Besides,based on the input-output tables in recent years,this paper provides the comprehensive research of the industry situation,and the effects on macro-economy of the industry in terms of economic aggregate,employment and price.It also deduces the demand factors of stimulating the development of the industry,and puts forward some suggestions for dredging enterprises expanding the ecology and environmental protection industry.