Based on the dual sector model and analysis of the data of complete consumption coefficients of the input and output of 18 departments, this paper indicates that ecological environment construction is directly related to a country's developing stage, to national economic input-output structure in this stage and to resources allocation structure of intergeneration accumulation consumption relation. The different attitudes towards intergeneration issue are also greatly influencing path and decision of ecological environment construction, and real input-output structure of economy and society is also restraining ecological environment construction.