Abstract: The gob-side entry driving with small coal pillars can improve the coal recovery rate and reduce the influence of lateral abutment pressure on the groove. The limit equilibrium theory and FLAC3D numerical simulation are used to calculate the gob-side entry driving to obtain better coal pillar size. The results show that when the width of the small coal pillar is 6~10 m，the roadway along the goaf is in the stress reduction zone at the boundary of the goaf，there is an elastic stable zone in the coal pillar，and the zero displacement zone is relatively large，and the deformation of the surrounding rock of the roadway is small. So choose 10 m as the final implementation width. Considering the particularity of construction tech⁃ nology，roof management，support requirements and the actual situation that the integrity of surrounding rock may be large，the roadway along the goaf is designed as a rounded rectangular section with better sta⁃ bility，and the bolt+anchor cable support scheme is adopted. The application effect of coal pillar size and roadway support scheme in Hecaogou Coal Mine is good，which provides reference for this mine and simi⁃ lar mines.

Key words: gob-side entry driving, coal pillar width, tunnel cross-section, coal mine