Abstract:Based on Literature Review and on-site investigation, this paper analyzes the Xieshan style of Ming Dynasty buildings in Irimoya, Yu County, and combs the combination of mojiao beams and other components, this paper analyzes the method of single side beam, the method of laying down side beam and the method of turning side beam, probes into the structural logic, the supporting system and the plane position of the step Purlin method, and further realizes the richness and flexibility of the method of building the mountain surface in Xieshan.