Abstract: To study the stability and width optimization design of narrow coal pillars along the goaf of fully mechanized caving face in inclined seam, based on the analysis of the mine pressure around the coal pillars along the roadway and the empirical formula of the reasonable coal pillar width (5.61~12.46 m) of retaining roadway, FLAC^3D simulation software was used to conduct numerical analysis and comparison of the stress field, displacement field and plastic zone distribution between the four coal pillar widths of 6, 8, 10 and 12 m without support. The result shows that the optimal retaining coal pillar width is 8.0 m. Therefore, based on the determination of the optimal retaining coal pillar width, the numerical analysis and comparison of the two supporting parameters are carried out by FLAC^3D, and the optimum supporting parameter design of the 2214 return airway is determined, that is active and passive combined support technology of high strength anchoring cable and shotcreting I-beam shed.