Abstract: In order to study the influence of coal rock's inclination angle on stope surrounding rock activity, we simulated the laws of underground pressure of different inclination angles of 0°, 30°, 45°with numerical simulation software FLAC^3D, analyzed the evolutionary process of stope surrounding rock stress, displacement and the plastic zone in front of coal wall. The findings indicated that the distribution of stress and displacement of roof and floor changed with the increase of coal rock's inclination angle, meanwhile, the value quantity of that also changed and the plastic zone in front of coal wall became small. The roof movement at the middle upside was obvious, but the floor movement at the middle downside was obvious. At the same time, the motion form of overlying strata changed from mere subsidence to the compound motion as subsidence- revolution-antirevolution with the increase of inclination angles.The different inclination angles changed the laws of motion of overlying strata, and then the laws of underground pressure were also changed.