Study on structure and design of the octagonal Buddhist pagodas, octagonal Buddhist buildings in East Asia of the ancient times and the Middle Ages

我收集了日本、中国、韩国、朝鲜遗留下来的八角形寺庙建筑遗址和中国、日本存在的八角形寺庙建筑的遗迹。现存建筑以木结构的形式分为两种风格。一种是日本安乐寺八角形三层塔的风格，另一种是中国应神木塔的风格。有分析认为，像古国丽遗迹一样的小型宝塔分为安乐寺式，而像日本虎师寺遗址遗迹一样的大型宝塔则分为应神式。此外，我认为八角形的宝塔可能是在单侧长度的基础上设计的。这是因为八角形宝塔体的边长与同时期的方形宝塔体的边长相似。

I collected the remains of octagonal temple building sites left in Japan, China, Korea, North Korea and the octagonal temple buildings which existed in China and Japan. Existed buildings are divided into 2 styles by the forms of wooden structuer. One is a style of Anrakuji octagonal three-stories pagoda in Japan, another is a style of wooden pagoda at Ying-shen in China. It is thought that the small scale pagodas, like remains of ancient Kokuryo, are divided to Anrakuji style, and the big scale pagodas, like remains of Hossyoji temple sites in Japan, are divided to Ying-shen styles. In addition, I think that the octagonal pagodas may be designed on the basis of a one side length. It is because the one side length of the octagonal pagoda body is similar to that of square pagoda body of the same period.