Abstract: The top coal caving makes coal natural fracturing and crushing and to emit from support drawpoint using mining support pressure,so good or bad of top coal caving characteristics becomes key to the mining method.According to occurrence condition of coal seam of Lutian coal mine,the paper analyzed and evaluated top coal caving characteristics for 1604 fully mechanized caving face of the coal mine by using the classification method of fuzzy mathematic and programming calculation of Matlab and combining the following six factors of coal seam strength,covered depth,joint crack developing extent,dirt band height,coal seam height and filling coefficient of immediate roof.The evaluation result showed that the top coal caving characteristics is good,and it has some guiding significance to production practice of Lutian coal mine.