In the process of excavating the foundation of gate dam in Yuliang navigation junction project,it is discovered that the shear weakness zone exists in the middle of rock stratum and the joint fissure is relatively developed;the integrity of rock mass is relatively bad.Meanwhile,the structural surfaces such as interlayer shear weakness zone,joint fissure surface and rock surface mutually cut each other and form into different size of blocks which are unfavorable to the anti-sliding stability of dam foundation.The deep-layer sliding doesn’t meet the standard requirements through calculation.After contrastive analysis and study on many schemes,the comprehensive foundation treatment scheme is adopted by combing with measures such as excavating partial weak interlayer,laying anchor pile layout and grouting the foundation for consolidation.