Abstract: In order to solve the problem of setting up narrow coal pillar in large mining height working face of deep well, taking the coal pillar between haulage gate and gas drainage roadway of 62101 large mining height face in the second panel as the engineering background, theoretical analysis and numerical simulation are used to systematically analyze the size of the section coal pillar. The coal pillar crushing zone width is 2.52 m by using limit equilibrium theory after the first mining, and the width of pillar between roadways was determined as 7.98 m. On the basis of theoretical analysis, the stress evolution law, the elastic-plastic region variation and the roadways deformation law of different pillars with the width of 4 m, 6 m, 8 m, 10 m were studied by numerical simulation. Comprehensive analysis of theoretical research and numerical simulation results, the actual production geological conditions of the working face were taken into consideration, the width of the coal pillar was determined to be 8 m.