Abstract: Based on observation and analysis of deformation and distribution of different coal structure, combined with different response characteristics of different coal structure on logs, this paper identifies and divides different coal structures of seam No.3 in Xinjing Mine. The results show that structures of seam No.3 are primarily of coal of classⅠand class Ⅱ, and locally coal of class Ⅲ develops. The coal structure which has been seriously destroyed mostly develops in the superposition area of tectonic movements of different periods, axis of anticline and syncline, small faults also can be seen in the vicinity. Coal structures suffering minor damage are mainly located in the area with seams of gentle ocurrence and wings of folds.