Abstract: This paper researches the abutment pressure based on stress monitoring system for the shallow buried coal seam about 100 m. The lead abutment pressure is obviously divided into three areas: slightly mining affected area that can divided into lower pressure zone and stable pressure zone based on the support pressure change trend is 30 m away; obviously mining affected area with the range of 10 m to 30 m, the lead abutment pressure gradually decreases with the increase of distance, but is larger than the stress of original rock; severely mining affected area within 10 m range, the lead abutment pressure increases sharply and elastic deformation of surrounding rock is severe. The lateral support pressure distribution is fluctuated and has two stress peaks, at the 5 m and 9 m near the coal wall, and its influence area is about 11 m and has the minimum at the 7 m and the roof fracture is at 5 m to 7 m. Finally, theoretical and numerical simulation software is used to determine the reasonable width of 15 m coal pillar.