The Lushan metamorphic core complex has a typical three-layer structure. The detachment belt is formed because of slip of the cover and shear deformation during the uplift of core. The detachment surface is undulating because of the uplift of the core complex which is superimposed on NE-trending folds. In the west of the core,foliation and mineral lineation are developed with dip direction of W,SW and NW,which indicated the cover slipped to the west and then formed the shear tensile deformation. Rocks in the detachment belt are mainly of mylonite and tectonic schist,supplemented with cataclastic rock and structural breccia. The deformation characteristics indicate that the core complex rocks are in middle-deep tectonic environment with plastic deformation at the early stage of uplift. With the continuing of uplift,the deformation domain gradually became brittle-plastic and finally brittle in the shallow environment. The detachment deformation not only formed detachment belt,but also affected the overlying strata and formed a upward deformation domain from stronger to weak. This regular change indicates that the deformation of the Lushan metamorphic core complex has vertical stratification. The temperature and pressure calculated by amphibole-plagioclase geothermobarometer are 653 ℃～694 ℃, 0.56～0.67 GPa respectively.