Abstract: Based on the 0913 return air roadway construction project of Qi Panjing coal mine, this paper uses the theoretical calculation and numerical simulation method to study the reasonable width of the narrow coal pillar of roadway in gob entry driving. First, the reasonable width of narrow coal pillar is 5.08m, which calculated through the limit equilibrium theory. Then using the FLAC3D numerical simulation software, the paper analyses roadway surrounding rock deformation caused by the different width of coal pillar. It is concluded that the reasonable width of narrow coal pillar is 5m ~ 6m. In order to facilitate the construction management, the final determination of a reasonable narrow coal pillar width is 5m. Keeping a reasonable width of coal pillar and adopting a scientific and effective support scheme, to ensure the stability of coal pillar are the key to the success of the narrow pillar of roadway in gob driving.