Abstract: The discontinuous deformation analysis method(DDA) was employed to numerically simulate the stress distribution and deformation of rock strata during the excavation in a coal mine.In order to verify the efficiency of simulation,the numerical results were compared with those of a modeling experimental measurement.It was shown that the variations of the stress field of rock strata,deformation and displacement of discontinuous blocks,strata collapse and abscises could be efficiently figured out by means of DDA method.There was a good agreement between the DDA simulation and the modeling experimental measurement.