Abstract: Investigating the relationship between the inclined bracket plane of the third - floor structure of the Timber Pagoda in Ying County and the plane of the same floor, this paper employs the octagonal construction as the basic model and deduces the design techniques for the third - floor plan of the Timber Pagoda in Ying County. As a result an in - depth analysis, it concludes that the design of the third - floor plan centers around the Buddhist altar. The inclined bracket plane is utilized to define the boundaries of the inner niche and the outer eaves, and the design incorporates a precise method of rotating the square corner. After applying the ratio relationship between the diameter and the side length of the octagon combination in the basic model to the section design of the current model, it verifies that this approach aligns with the actual situation of the third - floor section of the Pagoda. In this research of the Pogoda’s plans and sections, the paper recognizes the role of the inclined bracket at different design stages, and finds precision discrepancies between the plane design and the traditional octagonal model. It also discusses the role of the inclined bracket in the third - floor structure of the Pagoda in comparison with the traditional octagonal model.