Abstract: Coal mining method is controlled by mining geological condition which contains many factors.Each factor has influences on the mining way,but the adaptability of factors has no apparent limit,but only with fuzzy concept.The geological factors,in fluencing coal mining way of Jinjitan coal field,are devided into three kinds including fourteen evaluating factors.Their membership and weight value are determined with "step-dowm trapezoid"method and expert system.After the two step fuzzy comprehensive evaluation,it is considered that the mining geological condition in Jinjitan mine fits for mechanized comprehensive mining.The analogue analysis of mining area and adjacent mines indicated that the evaluation result is reliable.