Abstract: In order to provide the basis for the support resistance calculation and strata control of mining face with the shallow mining depth and thin bedrock，based on the engineering geological conditions and mining conditions of the 1-2# coal seam in Shendong Mining Area，the FLAC3D numerical simulations was applied to study the mine strata pressure behavior laws in the process of rapid mining velocity.Results show that the roof pressure trends to decrease as the mining velocity increases.The faster the mining velocity，the higher concentration degree at the front working face is，and the shorter the distance from the peak stress is.The distance between the face and the location of the peak abutment pressure also decreases.The zone of stress concentration tends to decrease.The roof breaking of coal seam with shallow mining depth and thin bedrock and thick unconsolidated layers directly affects the surface at the different mining velocity.The surface subsidence is obviously higher than the normal mining deep coal seam face at the same conditions；It is difficult to form bearing structure in the process of the overlying thick unconsolidated layers movement of shallow coal stope.Therefore，the load estimation of thick unconsolidated layers can′t be made by the traditional Pu′s compressive arch theory.

Key words: Shallow mining depth, Thin bedrock, Thick unconsolidated layers, Rapid mining velocity, Strata behaviors