Through field survey, it was found that the great majority of the landslides in Xiangjiaba segment of Jinsha River develop from the dam site to the Xinshi town segment where outcrop Jurassic strata, and most of these landslides are bedding slopes. The bedding landslide is apt to revive and the bedding bank slop is prone to revive after the reservoir impounding. A landslide database was established through field survey and with the help of geotechnical investigation dates. The effect of different dip angles to the development of landslides was studied by the contribution rate method, which is also applied to the bank structure types and river bought types. A quantitative statistic on those three factors was also made to analyze the contribution rate to landslides.The results showed that the dip angles of bedding surface to the maximum contribution rate are between 10° and 19°, the minimal contribution rate is between 30° and 34°.Similar to the dip angles,and the maximum contribution rate is gently dipping outer forward layered bank slope ,the minimal contribution rate is medium dipping outer forward layered bank slope.The concave bank of the river has the maximum contribution rate while the convex bank of the river has the minimal one. These results were coincide with the actual situation, which offers a quantitative criteria for evaluating the risk of reservoir bank slop and provides basis for planning and constructing of the reservoir in the future.
