The extension-detachment and ductile rheology similar to the western detachment belt outcrop in Niushidun, Xingzi, east of Lushan metamorphic core complex. The hanging wall of rock stratum slipping to the southeast shows its normal faults' property. And it is speculated that the eastern detachment belt of Lushan metamorphic core complex is exposed at this region rather than Wuli normal fault. The rock of the eastern detachment belt mainly contains mylonite, mylonitic rocks and migmatite, it also develops a lot of felsic veins. The formation temperature and pressure is relatively high and the buried depth is relatively deep. The mylonite zone and tectonic schist zone are preserved well. Kinematic vorticity is greater than 0.75, shows the detachment belt is given priority to simple shear. The formation temperature of the eastern detachment belt is 650 ℃~700 ℃ according to feldspar's deformation characteristics in mylonite, and the result is consistent with the western detachment belt. The extension age of the eastern detachment belt tested by zircon U-Pb dating is 140~135 Ma, it also represents the formation time of Lushan metamorphic core complex.