Zhanghuai Interchange is an incomplete interchange where the new and old Highway G108 intersect,with a complex alignment condition as it is constrained by multiple control factors such as villages,factories,county roads,and railroad crossings in the design process.Comprehensively considering the above constraints,this paper compared two interchange schemes and selected a safe,economical,reasonable,and feasible scheme,providing a reference for the selection and ramp alignment of similar interchanges.