Abstract: Coal pillar in goaf roadway can effectively increase the stability of surrounding rock.Reasonable determination of coal pillar width and supporting parameters is particularly important for the maintenance of goaf roadway.Taking Heilong Coal Industry's 2303 fully mechanized working face as the engineering background,numerical simulation and engineering analogy are used to study the width of coal pillar and the supporting method of goaf-side roadway.The feasibility of adopting the narrow coal pillar along the goaf in the transport way of 2303 working face is verified,and the design width of the coal pillar is determined to be 6 m.The failure law of surrounding rock with different widths of coal pillars is revealed,and the corresponding support control scheme is put forward according to the geological conditions of the 2303 mechanized working face.