Abstract: It is necessary to strengthen the support and analysis of the supporting effect before the over roadway mining, which is of great significance to guide the actual production of the mine. The paper takes the actual mining conditions of Bulianta Coal Mine as the engineering background, the FLAC^3D numerical simulation software is used to simulate and analyze the deformation of the surrounding rock in the straight groove of the bottom plate before and after strengthening support. The effect of supporting is evaluated by monitoring the displacement of surrounding rock.