This paper consists of the following two chapters, I. "Muro" buildings in 8th century literature. II. The architectural images of "Muro" buildings. This is the first half of the thesis "On 'Muro' building and 'Nifimuro-no-Utage'". The author will present a synopsis of the whole thesis in the next issue of "Transactions of A.I.J." in which the latter half of the thesis will be published.