Abstract: Various phenomena like dry-wet cycles, seepage, and erosion indicate that the Three Gorges Reservoir (TGR) area has been in a long period of frequent water environment. In the complex hydrogeological environment, many dangerous rock masses have formed in the Wushan bank slope, and there is a great possibility of geological disasters. In this paper, field investigations on dangerous rocks in the bank slope of the Wushan section of the Three Gorges Reservoir area were carried out. Based on the investigation results and geological data, the water-rock deterioration characteristics, the distribution and types of dangerous rocks in the bank slope, the influencing factors of stability, and the instability failure modes were clarified. The results show that there are obvious physical, chemical, and stress characteristics of water-rock deterioration, and those characteristics jointly affect the shape and strength of the hydro-fluctuation belt and bank slope stability. The formation of dangerous rocks in the Wushan bank slope is mainly affected by geological structure, environmental factors, and time effects. The types of dangerous rocks can be generalized as columnar shape, plate-like shape, wedge shape, and row-columnar shape. The key influencing factors of dangerous rock stability are mainly rock mass deterioration in the hydro-fluctuation belt, weak interlayers, deep and large fissures in the trailing edge, reservoir-induced earthquakes, and other environmental factors, which are closely related to water-rock deterioration. Four types of dangerous unstable failure modes were proposed: slip type, erosion-falling type, base buckling type, and toppling (gradual toppling) type, and some suggestions on prevention and control measures for dangerous rock masses were put forward.