According to the geotechnical conditions in some coal mine,numerical simulation was made on the floor heave of the railway upward gateway.And the distribution of stresses in surrounding rock and displacement of floor under stress-release cut being excavated in the floor or two sides of the gateway were analyzed.The stress releasing method could method could transfer the high stress to inside rock and protected the integrality of surrounding rock after gateway being excavated,so as to create favorable conditions for latter supporting of roadway.The effect of stress release will be markedly affected by the depth of stress-release cut when stress-release cut is excavated in the floor of roadway.The simulation results indicate that the best depth of stress-release cut is 60% of the width of the roadway floor,at the same time,the excavation amount of stress-release cut is least.