Abstract: Xiaozhuang Mine Jurassic Yan'an formation coal seam belongs to thick coal seam in Binchang Mining Area, and widely distributed in the region.In the mine field, paleo uplift development, formation thickness, shape and thickness of coal seam and the topography affected by the structure; in local area, the coal seam is pinch, thin, erosion, loss. Interpretation of the coal thickness is difficult. The thickness of the depressed area is relatively thick and the distribution is stable. Rules based on seismic forward simulation of coal seam thickness change caused by coal wave group characteristics change, combined with drilling, we summarize the correlation that area coal seam thickness change with its occurrence depth, and use coal seam hosting pattern and reflected wave group characteristics of the combination method to explain the coal change trend, which is consistent with the result of geological rules.