A decision supportive tool “map of decision network for eco-industry”(MDNEI) was presented to structure and integrate the decision problem according to the needs of decision makers.The process of applying the tool was discussed.A MDNEI application based on the eco-industrial development plan of a natural gas chemical company was presented as a case study.The paper shows how the company decision-makers and the consultants brought forward the initial solutions and made choices

and corresponding MDNEI generating and shearing processes.The final solution was obtained based on three kinds of decision processes

directly qualitative judgment

synthetically quantitative judgment and structural inference.