Abstract: To better seal and plug micro fractures in the surrounding rock of deep wells, the numerical simulation software ABAQUS is used to simulate the expansion of fractures by establishing a hydraulic fracturing numerical model for the sandstone about 1 500 m in Jingbian Area based on the hydraulic fracturing theory. The conclusion shows that, under the influence of in-situ stress, hydraulic pressure and elastic modulus, fracture propagation has obvious law, while natural fracture has little effect on fracture propagation.