Abstract: The sliding phenomenon between coal seam and its roof or floor is very common.Seam-gliding structure is the major factor that makes coal seam unstable, often caused by sudden changes in thickness of coal seam, even formed non-coal district, seriously impacting production. In order to master and find out the distribution law and development intensity of seam-gliding structure, fuzzy comprehensive assessment was used, six assessment indices, i.e. seam-gliding fault density, abnormal index of coal seam, fault density, intensity index of fault, development intensity index of structural coal, quantitative parameters of rock combination were taken to evaluate the complex degree of the seam-gliding structure in coal mine. The results showed that the results from using fuzzy comprehensive assessment were similar with the results exposed by coal mine. Good effects were obtained for predicting the development intensity of the seam-gliding structure in deep unmined areas in combination with geological conditions of coal mine, providing references for production arrangement of coal mine.