Abstract: According to the easy separation and falling of thin bedded roof, the serious convergence of the two side walls, high floor heaves of the mining gateway and the serious deformation and failure of large section mine roadway in Shuguang Mine, based on the combined beam theory, a dispersed element numerical simulatio n was applied to analyze the roof falling mechanism of the mine roadway. Base the mechanism, the roof protected area of the roadway support should be increased and the stability of the roadway integration should be enhanced.300 mm x 300 mm x 28 mm steel plate and No. 12 U-steel with the bolt/steel mesh/anchor combined support system was applied to roof support and the W steel plate and the steel band with the 2 000 mm long bolt was applied to the support of the two side walls.The observatio n results showed that the support effect was obvious.The total roof and floor convergence value and the two side wall convergence value of the large section gateway W ere 179 mm and 132 mm individually and were reduced over 20% than the previous gateway deformation.