Nitrogen injection , as a commonly used measure of fire and spontaneous combustion prevention , like ventilation and gas extraction of the gob , could influence the flow field of the whole face and gob .In order to reach the goal of optimization about safety and economy , the air output , gob total flow tube , the height of tube , the flow tube spacing , nitrogen injection , and the location of nitrogen injection were selected to design a orthogonal experi-ment , by means of numerical simulation software orthogonal test program for the three-dimensional flow field simula-tion.Based on the theory of fuzzy mathematics , the fuzzy optimal evaluation index and index weight were chosen , the results obtained were optimized , and the optimal solution for all factors were obtained , then the excellent combi-nation was obtained .So the optimization of injection in golf ,gas extraction and ventilation parameter in working face can be achieved .%采空区注氮是一种常用的采空区防灭火及治理遗煤自燃的措施，与采空区瓦斯抽采及工作面通风相似，均会对整个工作面及采空区流场产生影响，为了实现工作面及采空区生产安全性及经济性最优化，对进风量、采空区流管总量、流管高度、流管间距、注氮量、注氮位置六因素进行正交试验，借助数值模拟软件对正交试验确定的方案进行三维流场模拟，根据模糊数学相关理论选择模糊优选评价指标及指标权重，对所得结果进行优选，得到所有因素的最优解，进而得到优组合。实现采空区注氮、瓦斯抽采及工作面通风参数优化。
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