The surrounding rock of stope in phyllite ground spalled seriously at some mine,so a similar material model were set up to simulate the stability of stope.The simulated results indicated that reserved ore pillars can disperse the tension stress in the middle of the stope.During the course of stoping reserved ore pillars up to 16 m and 28 m from the floor can reduce the danger caused by ground pressure to mining operations.The 4 m×4 m section of reserved ore pillar is enough and the recovery ratio of ore is enhanced because the quantity of reserved ore pillars is much smaller than quantity of ore mined for increased mining height.The results of the research have made good effect in practice.