A Study on Octagonal Angled Elements of the Ancient Chinese Architecture-Focusing on Beginning and Meaning From Unified Silla to Joseon dynasty, there were many octagonal angled pagodas(Pal-gak-tap) in Korea. Even though Buddhism was introduced from China, unlike China, in Goguryŏ(~A.D. 668) there were usually constructed octagonal angled wooden pagodas. Most of relic stūpas for Sŏn masters in Buddism in Unified Silla were eight-sided pedestal shape. Goryŏ, it stands for Goguryŏ, also constructed octagonal angled pagodas especially in Pyong-yang, the capital of Goguryŏ, All of octagonal angled pagodas in entire periods in Korea were distributed in the north of the Han river which was territory of Goguryŏ. Therefore the origin of Korean octagonal angled pagodas can be found in Goguryŏ. A pagoda was began with the shape of round tomb in India which Buddhism had its beginnings in. This basic shape of it can be changed in its size or stylobate by regional groups, however, It was not big difference from Gandhara to Central Asia. But in 2~5th century, among votive pagodas in temple which has center pagoda in Gandhara, there were four or five octagonal angled pagodas. It is quite remarkable that these are related to octagonal angled pagodas in Goguryŏ. In 4~7th century, octagonal angled pagodas were built in Goguryŏ. However, only square shaped pagodas were made in China. Only ten dedicated small octagonal pagodas were built during Buk-Ryang dynasty(397~439AD) in the east of Dunhuang and out of the center of China. There were in popular such as Eight Trigrams for divination of Buddhism, the Book of Changes and Taoism, Maitreya belief, Thought for the ruin of Mahayana Buddhist Sutras, Esoteric Buddhism. The octagonal shaped buildings were built before the transmission of Buddism from China in Goguryŏ. So I think the original thought of Goguryŏ had inflenced on Goguryŏ's octagonal angled pagodas. I tried to diagnose the usage of octagonal angle in China in connection with the distinctiveness of Goguryŏ's octagonal angled pagodas. Chinese had builted octagonal angled religious architecture such as Chun-dan(a religious establishment for Heaven) from West-Han dynasty. They were succeeded from the prehistoric age. Octagonal angle symbolized heaven, the earth, the space between the sky and the earth and the space for ghost. Another octagonal angled buildings are Islamic temples. We can find out the octagonal angle in the traditional concept on Chun-dan, an ideal buildings based on the concept, and a musical instruments in a field of record. I know the concept on octagonal angle in China is a mix of concepts with Eight Trigrams, the eight points of the compass, symbol of the sky and the earth and the space for ghost.