Abstract: Hydrogeological type of No.2 coal seam area in Balasu Coal Mine is complex, thus it is necessary to determine the development patterns of “two zones”（fractured and caved zones）,providing a basis for predicting roof caving and water inrush during mining.This paper conducts a numerical simulation study on the development of the “two zones” for No.2 coal seam in Balasu Coal Mine with mining heights of 3.2 m and 4.6 m using FLAC^3D.The results indicate that under the conditions of a mining height of 3.2 m, as the working face continues to advance, the height of the fracture zone eventually stops increasing, with some fractures in the central goaf area being compacted and closed.The development height of the caving zone at the working face is 17 m, the development height of the water-conducting fracture zone is approximately 105 m, with a caving/mining ratio of 5.31 and a fracture/mining ratio of 29.68.When the mining height is 4.6 m, upon advancing the working face to 1 000 m, the working face reaches full mining activity, with the entire roof of the working face collapsing.The development height of the collapse zone above the coal seam roof is 25 m, and the development height of the water-conducting fracture zone is 138 m, with a caving/mining ratio of 5.43 and a fracture/mining ratio of 30.00.When the working face reaches full mining activity, the rock mass of goaf roof collapses entirely in shear failure mode.As the working face continues to advance, the overlying rock strata above the goaf continue to be destroyed by shear failure, with tensile failure occurring in the middle of the direct roof above the coal seam.The failure of the overlying rock strata above the goaf maintains a “saddle shape”, and the vertical development speed of the failure zone above the coal pillar near the entry increases rapidly.