The formation occurrence changes little, and the dip angle is generally less than 25 degrees. Therefore, the geological block method is adopted to calculate the reserves on the contour map of the coal floor with a ratio of 1: 10000 and a vertical interval of 50m by zoning, level, coal type and level. The reserves of each block are obtained by the product of four parameters: the flat area of the block, the average thickness of the coal seam, the normal cut value of the dip angle of the stratum and the average density of the stratum.