Abstract: Based on the actual situation of Qianqiu Coal Mine，the deformation mechanism of large roadway over two groups of rock strata is studied by numerical simulation .The study results show that:① The stress in the wall of a large roadway with a depth of more than 1 000 meters is large，and the maximum stress can reach about 50 MPa;②Arched roof is easier to deal with deep high stress environment than rect⁃ angular or trapezoidal roof，which is helpful to reduce the scope of plastic failure zone;③When the main roadway is located in the middle of two groups of rock strata，the rock strata with larger strength is benefi⁃ cial to the maintenance of the roadway in this part;④The shear failure zone developed along the roof and floor of a roadway is mainly caused by the shear caused by the vertical wall.According to the situation that the roadway passes through the rock strata，the sectionalized support scheme can be designed，by changing the support density and strength and designing the support scheme according to local conditions，it can avoid insufficient support strength in some sections or excessive support strength in some sections when the whole roadway adopts one support scheme，and reduce the support cost on the premise of guaranteeing the support effect to a certain extent.

Key words: mine supporting, large buried depth, roadway deformation, numerical simulation