Abstract: The purpose of the paper is to design a single-shaft folding high wing for "Dream IV" Light Sport Aircraft. A simplified wing model was established, and analytic geometry principles were used to analysis it. And then the structural separation surface position was adjusted according to the results to eliminate the constructive interference of the airframe structure. With the results from the simplified model, a more realistic model of the wing was founded by Catia. Through the DMU in Catia, the interference of inner and outer sections of the wing was eliminated, the detailed structural design of ear piece was made, and the fixed issue of the wing before and after folding was solved. The design was finally applied to "Dream IV" LSA, in which only one rotation was needed to package the wing, demonstrating the advantages of fast and convenient package, simplified structure and less weight.