Abstract: In view of the issues in coal pillar′s reserve in protecting 2621 transport crossheading of the Yuanbaoshan Hongmiao mine in Chifeng City，mechanical parameters of coal ore and rocks are determined by indoor test.With the combination of the limit equilibrium method and the numerical simulation，the displacement of surrounding rock and the change of plastic zone are analyzed to ultimately determine the reasonable width of coal pillar and the effective supporting scheme.The research indicated that the larger the protective coal pillar′s width is，the smaller the mining and goafplastic range and the displacement of roadway tunnel area are.Then，the tunnel becomes more stable.Ultimately，the coal pillar′s width is determined to be 25 m; 2621 transport crossheading roadway is reinforced under strong constraint of small coal pillar，that is，the combination of cable+ plate + grouting and shotcrete.This method makes the roof and floor convergence decreased by 50.3%，two-side convergence decreased by 81.0%.This result illustrates that the design scheme above can effectively control the deformation of roadway.

Key words: Pillar width, Laboratory test, Theoretical calculation, Numerical simulation, Bolting and shotcreting