The coal pillar width of the 2102 working face section of Heilong Coal Industry was 35 m. In order to improve the resource utilization, the coal pillar width of the section was optimized. The field pressure monitoring, theoretical analysis and numerical calculation research showed that the 35 m wide Section coal pillars had a large space for optimization. The reasonable section coal pillar width of the 2103 working face was 21.5 ~ 26 m. In actual production, the coal pillar width was set to 25 m. During the 2103 working face mining, the surface of the 2103 transportation roadway, the monitoring results of surrounding rock displacement showed that the maximum cumulative approach of the top and bottom was 169 mm, the maximum cumulative approach of the two sides was 383 mm, and the deformation of the roadway was within a safe and controllable range, which could meet the normal mining of the 2103 working face. The segment coal pillar was optimized to 25 m, which achieved good application results and economic benefits.