Abstract: Stress variation of deep soft rock roadway after tunnel excavation is extremely complex, it is difficult to find the distribution of stress state; high stress soft rock roadway often appears serious heaving floor, caving and rib spalling phenomenon. In order to find the stress changes of floor rock roadway, we analyze the change laws of heaving floor in Liangjia Coal Mine No.2 tunnel by using FLAC^3D numerical simulation software, after the excavation and supporting in No.2 roadway, we monitor the amount of heaving floor of 1 m, 2 m, 3 m and 4 m at the roadway floor, and use the principle of least square method for curve fitting. Through the mine pressure monitoring in field, the results show that, in the condition of No.2 roadway, the fitted curve meets the actual amount of heaving floor of the tunnel.