Abstract: In the process of rock cross-cut coal uncovering practice, in order to know the size of the possibility of coal and gas outburst in each unit of coal uncovering region in advance, PFC software is used to carry out particle flow numerical simulation of coal seam to intuitively predict. Because the simulation process is unable to take into account the influence of gas pressure, the study makes the results can better reflect site actual situation based on the simulation results and the gas pressure weighted calculation processing. Through the simulation results after comprehensive treatment, based on the simulation results and weighted processing gas pressure, maximum possibility occurrence of coal and gas outburst in each unit of rock cross-cut coal uncovering coal region located around the roadway, the closer to the roadway, the greater of the risk of roadway is.