The overall design scheme of Hefei Changtong Ring II · North Ring Expressway Reconstruction Project is analyzed and studied. The construction conditions of the project are analyzed, its planning is interpreted, and the functional orientation, the study essentials and the difficulties are obtained. The road cross section and construction scale of the project are determined through the traffic flow prediction. The overall layout scheme focusing on how to effectively shield the cross-city traffic on the ring expressway is studied. The layout of interchange nodes and ramps is comprehensively considered. Finally, the key and difficult points in the design of the ring expressway are summarized, and the treatment measures for the complex switching system of the main and auxiliary roads in the road section are proposed.