Abstract: Based on the Cangrong Xunjiang Bridge project， relevant research was conducted on the design and stress characteristics of the large-diameter pile-wall composite anchor foundation. By analyzing the anchor foundation scheme of Cangrong Xunjiang Bridge， the overall layout of the bridge， anchor foundation， anchor cable system， and other design schemes were elucidated. Combined with the geological conditions of the anchor foundation， the displacement and internal force of the pile-wall composite anchor foundation on the south side of Cangrong Xunjiang Bridge were analyzed. The impact of pile-wall connection types on the bearing capacity of the anchor foundation was analyzed， and a comparative study was conducted on four types of pile-wall connection types： fully connected pile-wall， fully separated pile-wall， interface-connected pile-wall， and pure pile foundation. The research results indicate that the deformation and internal force of the pile-wall composite foundation meet the requirements under construction and cable-hoisting operation conditions. The fully connected pile-wall is the ideal optimal form， whereas the pure pile foundation is the least effective form. Despite this， both are capable of meeting the requirements and possess a bearing capacity over 2.0 times the cable force. Upon completion of the pile-wall composite anchor foundation， the overall structure is in a good state of stress.