Abstract: Physical and mechanical parameters of the oil shale and its wall rock from Fuyu County in Jilin Province were measured， on the basis of which， unit weight， elasticitymodulus， Poisson′s ratio， internal frictional angle， cohesion and other parameters were obtained. And the SIGMA/W module was used to calculate elasticplastic finite element model， thus，the stress，stain and displacement of any point within insitu mining area were gained. The results show that the maximum subsidence displacement is 105m， which is located at the center of mining.Meanwhile， according to these information， the stress distribution of rock mass is analyzed. Tension zone is consistent with larger shear stress extreme distribution area， both are located in shale which is the overlying strata of oil shale， thus the failure process of rock mass is determined. First， rock mass is stretched， producing a large number of cracks， and then occurs sliding along the crosssection where the shear stress extreme.

Key words: oil shale, physical and mechanical parameters, insitu mining, subsidence displacement, the failure process of rock mass