Abstract: The connection between flexible asphalt concrete core wall and rigid concrete corridor is a weak link of dam anti-seepage system.Aiming at the high asphalt concrete core rockfill dam of Laluo hydro-junction project, three different connection types are designed.Considering the contact stress characteristics between asphalt concrete core wall, concrete corridor, earth rock dam filling material and bedrock, finite element models are established respectively to simulate the process of dam filling and water storage.The stress and deformation characteristics of three different connection types between asphalt concrete core wall and concrete corridor during completion and water storage periods are studied, and the advantages and disadvantages of various connection types are compared and analyzed.Based on the results, an optimal connection type between concrete corridor and asphalt concrete core wall is put forward.The results show that during the completion period, if the settlement of the core wall and transition materials on both sides is uniform, the arch effect of the core wall is small.During the storage period, the uncoordinated horizontal displacement of the core wall and the corridor will lead to the sudden change of the vertical stress at the bottom of the core wall.The third connection type that can make the asphalt concrete core wall, the corridor and the rockfill behind the corridor deform coordinately is the optimal design scheme.The research results provide a theoretical basis for the structural type selection of asphalt concrete core wall.