Abstract：In Jiujiang-Ruichang area, there are multi-level, multi-period and multi-type gliding detachments. The basement detachment faults and the unconformity between Neoproterozoic and Sinian and Silurian are territorial detachments, which control the detachment structures. Deformations are different at different levels. Four detachment systems (Presinian basement, Cambrian-Ordovician, Silurian, Devonian-Triassic) can be recognized. Different types of detachment structures were developed in different periods characterized by different backgrounds of geotectonics, which include extrusion detachment during Late-Jurassic to Early Cretaceous, extensional detachment in original Early Cretaceous (140Ma) and gravitational detachment in the late stage of Early Cretaceous period (113Ma).