The problem of deposits slope is often encountered in constructions of hydropower projects in Southwest China. The study combines geology phenomena and drill core data

based on areal geology survey

rainfall data

and so on. The thought of engineering geology qualitative analysis is applied to study on the slope stability. On the basis of geological analysis

the deposits body has the feature of multi-stages and composite formation mechanism

and it is one of typical evolution models of the bank slope of Nujiang Great Canyon. The coupling effect mechanism of endogenic and exogenic geological processes of the deposits body is proposed. Aiming at spatial structure features and special location of deposits slope

the finite-difference and strength-reduction method is adopted to compute its stability factors under natural

rainstorm

seismic conditions. The above discussions offer reasonable evidence to constructions of the project and partial reinforcements of the slope and provide reference for stability analysis of similar deposits slopes in the river basins.