Using the method of multi aim fuzzy analytical hierarchy process, the indexes system and the judgement model of comprehensive evaluation of the energy saving projects of township enterprise were established. The author studied the subordinate function, the numerical method to conform the subordinate degree of the judgement indexes and the method of combination operation. The evaluation software system on computer was designed by using Visual Basic (6.0). Through the typical cases, the method and the system were verified in application. The result indicated the established indexes system reflected the integrated effect of energy saving project in impersonality and reality through three aspects of technology, economy and social environment. The established judgement model reflected the characteristics of fuzzy, integration and multi hierarchy in comprehensive evaluation to energy saving project,also offered the scientific basis for evaluating the overall excellence or badness of the project and investment decision making.