Landslide is one of natural catastrophes affecting national economy and people’s livelihood There are many reports on the forming mechanism and control of landslide, but the studies on micromorphology of landslide soil are few. There are many potential landslides in the Three Gorges Region in China. In this paper, the micromorphologic features of the Jibazi landslide soil in Yunyang in the Three Gorges Region of the Yangtze River were studied using routine methods, that is, soil micro- morphology, X-ray diffractometer and scanning electron microscope. The main conclusions are as follow: (1) The basic micromorphologic characteristics of the landslide soil are that the fine soil particles are commonly cohesive matrix, finer and lower content o skeleton grains, the microstructures are mainly types of phenocrystal gelatinization, densely chap and fissure structure. As a result, these micromorphologic features affect the discharging of soil water, favor the movement of landslide body and provide an interna basis of materials for the formation of landslide. (2) The concept on the forming material of landslide was proposed, and types of optical beamed clay aggregates Fe-Mn isolates and glassy material were found in landslide-belt soil, which were remarkably differen from the natural soil formation, and had some scientific significance in analyzing the formingmechanism of landslide and distinguishing the landslide-belt soil. (3) Some special micromor- phologic and sub-micromorphologic characteristics, such as fingerprint microstructure, clay beamed bedding microstructure, oppressive microstructure, moulage microstructure and extending hole microstructure, could bring useful micromorphologic evidences for the observation and forecasting of landslide. The results mentioned above will bring helpful micromorphologic evidences for distingui- shing slide soil, analyzing the formation mechanism of landslide, and monitoring and forecasting the occurrence of landslide. Landslide is one of natural catastrophes affecting national economy and people’s livelihood There are many reports on the forming mechanism and control of landslide, but the studies on micromorphology of landslide soil are few. There are many potential landslides in the Three Gorges Region in China. In this paper, the micromorphologic features of the Jibazi landslide soil in Yunyang in the Three Gorges Region of the Yangtze River were studied using routine methods, that is, soil micro- morphology, X-ray diffractometer and scanning electron microscope. The main conclusions are as follow: (1) The basic micromorphologic characteristics of the landslide soil are that the fine soil particles are commonly cohesive matrix, finer and lower content o skeleton grains, the microstructures are mainly types of phenocrystal gelatinization, densely chap and fissure structure. As a result , these micromorphologic features affect the discharging of soil water, favor the movement of landslide body and provide an interna basis of materials for the formation of landslide. (2) The concept on the forming material of landslide was proposed, and types of optical beamed clay aggregates Fe-Mn isolates and glassy materials were found in landslide-belt soil, which were remarkably differen from the natural soil formation, and had some scientific significance in analyzing the forming mechanism of landslide and distinguishing the landslide-belt soil. (3) Some special micromor- phologic and sub-micromorphologic characteristics, such as fingerprint microstructure, clay beamed bedding microstructure , oppressive microstructure, moulage microstructure and extending hole microstructure, could bring useful micromorphologic evidences for the observation and forecasting of landslide. The results mentioned above will will help micromorphologic evidences for distingui- shing slide soil, analyzing the formation mechanism of landslide, and monitoring and forecasting the occurrence of landslide