Abstract:Large consequent bedding rock landslide is one of the most serious geological disasters. The evolution of landslide is controlled by the characters of sliding zone. And then,evolution process and pattern of sliding zone in the landslide become the key scientific questions. Firstly,the distribution and sliding zone development of large consequent bedding rock landslides in the Three Gorges Reservoir area are analyzed. Secondly,the evolution process of sliding zone of the landslide is divided into three stages,i.e. original soft rock,interbedded shear zone and sliding zone. Thirdly,the evolution of sliding zone characters is studied by comparing the characters in the three stages. By field investigation,grain test,X-ray diffraction(XRD),differential thermal analysis(DTA),scanning electronic microscope and energy dispersive X-ray(SEM-EDX),physicochemical test and physico- mechanical test,the physical property,clay mineral component and content,microstructure and contact feature,physicochemical property and physico-mechanical property are systemically studied. Finally,the evolution pattern of sliding zone in large consequent bedding rock landslide is shown. The following conclusions can be drawn in the evolution of sliding zone. (1) The grains size become finer. (2) The content of clay mine rises,the interbedded shear zone is montmorillonitization;and the sliding zone is illitization and kaolinitization. (3) The microstructural character of interbedded shear zone is most unfavorable. (4) The physicochemical and physico-mechanical characters of the intebedded shear zone are most unfavorable. (5) The characters of the interbedded shear zone are most unfavorable;and the landslide with interbedded shear zone should be paid more attentions to.