Abstract: In order to research the effect laws of pore water pressure on stability of surrounding rock of roadway in soft rocks under the deep and high stress environment, a two-dimensional finite element model is established to simulate the effect of pore water pressure on stability of surrounding rock of soft rocks roadway and the distribution laws of water pressure during coal mining, according to the engineering geological data of S2S9 of working face of Daping Coal Mine. Simulation results show that the region of high pore water pressure near the working surface and open-off cut is gradually enlarged, along with the increase of goaf area. So that, the dangerous area of the water burst of roof working face is enlarged; the pore water pressure presents the trend of high at both ends and low in the middle, which accords with the saddle type damage area above the working surface.