Abstract: The complex geological conditions of Yebatan high arch dam make its stability and safety issues concerned,which is a core problem for safety evaluation and reinforcement solution.Based on the finite element calculation,we analyzed the stability of the abutment under natural foundation condition,and accordingly proposed reinforcement measures for the weak parts.By numerical and experimental analysis,the stability and safety of the abutment and the effectiveness of the reinforcement measures were analyzed.The results showed that the arch dam and both abutments had large displacements under natural foundation,presenting obvious asymmetrical displacement on both abutments,and the structural planes near the abutment were mutually displaced,proposing a dominated control on abutment stability.After reinforced,the displacement of both abutment and foundation decreased,with the displacement symmetry significantly improved.The research results showed that reinforcement measures for structural planes had a good effect on the deformation of the arch dam and the stability of the abutment.