Abstract: Through the application of 3D laser scanningand manual measurements, this study thoroughlyanalyzes and interprets the dimensions and geometricaldesign of the plans of the corner pavilion of ChunyangPalace at Taiyuan. The findings suggest that an originalconstruction ruler with a measurement of 318mm wasemployed during the initial design phase. Drawing uponChinese and western literature, the research examinesfour possible methods for constructing a tetradecagon andexplores their relevance to the plan composition design.