Abstract: In order to reduce the amount of roadway excavation and guarantee mine ventilation safety, improve resource recovery rate and single efficiency, we researched mine pressure regularity by theoretical analysis and numerical simulation, the method of steep seam horizontal stratification Z type ventilation roadway retained caving method in the dip direction are easy to form more stable hinge so as to prevent roof rock stand directly on support, which resulting in the work face support force smaller and gangue falling down along the bottom, easy accumulation to the roof over the side of the plate side. It will form the bottom side of the roof side pressure greater than the pressure, leading to face pressure from the bottom side to roof side gradually, and the working face of mine pressure test the correctness of the above theory.