Abstract：The bank slope structures in the Three Gorges Reservoir area are divided into rock bank slope，soil bank slope and combination bank slope of soil and rock，based on the types and combinations of rocks and soils in the Three Gorge Reservoir area. And then，the failure modes of each kind of bank slopes were analyzed and summarized. The suitabilities of prevention methods of bank slopes in the Three Gorge Reservoir area are studied in detail based on the geological structure，failure mode and scale of bank slopes. The results show that 5 suitable stabilization methods of bank slopes in the Three Gorge Reservoir area are as follows：(1) to stabilize those rock bank slopes which are easily weathered，and to stabilize those in which competent layers alternate with incompetent layers，tieback and shotcrete plus part buttressing or unloading should be taken；(2) to stabilize those soil bank slopes which are thicker than 10 m，and in which failures have already taken place，and to stabilize those rock bank slopes which contain incompetent beds and incline in the same direction as that of strata，driven piles plus surface slope protection and surface drainage should be taken；(3) to stabilize those soil and combination bank slopes which are thinner than 6 m，and base grounds are stable，retaining walls and surface drainage should be taken；(4) to stabilize those soil and combination bank slopes which are thicker than 6 m，and gradients are less than 20°，rip-rap with cuboid stone plus gabions or block stones should be taken；(5) to stabilize those soil and strong weathered granite bank slopes which are thicker than 6 m，and gradients are greater than 20°，grid anchorage technique and surface drainage should be taken. Finally，typical bank slopes are designed to be stabilized with the methods mentioned above. The results show that total cost of 1 km bank slope stabilization work is about 857.2´104，2 246.0´104，931.5´104，625.5´104，2 288.8´104 yuan，respectively. Therefore，scientific data are provided for the 3rd plan of geo-disaster prevention in the Three Gorges Reservoir area.
