本文通过对开化寺大雄殿这座11世纪的木结构建筑进行三维激光扫描测绘,旨在通过测绘数据的分析推导出原初的大木尺寸设计。作者初步推算出古代匠人在开化寺大雄宝殿的大木尺寸设计中使用了306毫米长的营造尺,并进一步分析了大木尺寸设计的基本方法,检视了该建筑的平面丈尺、斗棋、屋架等设计细节。 This article through the Kaihua Temple Daxiongdian this 11th-century wooden structure of three-dimensional laser scanning mapping, mapping data to derive the original analysis of the design of large wooden size. The author tentatively deduced that the ancient tradesmen used a 306mm long construction scale in the design of the large wooden size of the Main Hall of Kaihua Temple and further analyzed the basic methods for the design of large wooden dimensions and examined the design of the flat roof, detail.