Abstract: In order to solve the disturbance caused by the coal pillars in the upper coal seam to the lower coal mining roadway, this paper takes the 13313 main gate of thick coal seam face in Shanxi Shide Sunjiagou Coal Mine as the engineering background, the system research is carried out in combination with FLAC3D numerical simulation in three aspects: surrounding rock stress, surrounding rock strength and supporting technology. The results show that the stress concentration zone is formed under the left coal pillar. The larger the remaining coal pillar size, the smaller the lower stress peak, and The stress environment is greatly improved when the main gate of the lower coal seam are out of alignment for 25m from the left coal pillar. Further in-situ testing of roadway surrounding rock strength is carried out, and the technical scheme of high prestressing and strong support is determined. Mine pressure monitoring shows that the roadway support scheme is reasonable and can meet the production requirements, so as to solve the technical problems of dynamic pressure roadway support in Extra-thick Coal Seam under coal pillar.