Abstract: In order to observe crack initiation effects of hydraulic fracturing measures in fracturing coal seam crack in an intuitive, RFPA^2D-Flow software to simulate the working face 31010 in Pingmei No.10 Mine ten mine is adopted. Simulation software clearly shows the hydraulic fracture crack initiation,expansion and extension.Through the numerical simulation of the drainage holes and pressure hole with hole spacing of 5 m, 6 m, 7 m, the simulation results show that after the hydraulic fracturing on the coal seam, permeability changes apparently, the coefficient of permeability increases 4～6times, the highest increases to nearly 10 times, increasing permeability effect is obvious. The results also show that the coal hardness, water pressure, the hole diameter and other factors under certain conditions, the hydraulic fracturing effect is certain.