Wangheungsa Temple Site and the Eastern kiln site in Buyeo are considered to represent the supply and demand system of the area within a short-distance range. The roof tiles produced at the Eastern kilns are believed to have been supplied to the construction site of Wangheungsa Temple. Against this backdrop, the present study calculated the number of roof tiles needed for the construction of Wangheungsa Temple and the production capacity of the Eastern kilns. During its foundation period, Wangheungsa Temple would have needed 160,000-210,000 roof tiles; the production capacity of the Eastern kilns stood at 8,600 per session. Taking into account the evidence for the number of firing sessions, it is possible to establish that the amount of tiles produced within the kilns would not have been enough to meet the supply needed for the construction of Wangheungsa Temple. Therefore, contrary to the existing belief, it is highly likely that several roof tile workshops were involved in the construction of Wangheungsa Temple. At the time that the Eastern roof tile kilns were in operation in Sabi (Buyeo) in the late sixth century, Baekje had established a bureaucratic system and had run government operated workshops. It is likely that the development of Iksan, the dispatch of Wabaksa to Wa (Japan), and a number of natural disasters that occurred around this time had a significant impact on the development policies of the Baekje capital, Sabi. More specifically, it is reasonable to assume that the reorganization of craftsmen and the resource re-distribution policy had an influence on the size and amount of production of government-operated workshops. The imbalance between the demand for roof tiles for Wangheungsa Temple and the production that took place at the Eastern roof tile kilns should be considered in this context.