The Stone Pagoda at Mireuksa Temple Site, Iksan, built during the reign of King Moo(武王) of Baekje(百濟), is one of the earliest stone pagodas in Korea. The main feature of the Stone Pagoda at Mireuksa Temple Site, Iksan is the technique of constructing the pagoda body using a technique of constructing stone structures that is difficult to find in China or Silla during the same period. In this study, we inferred that the origin of the Post & lintel construction technique of the stone pagoda of Mireuksaji Temple in Iksan came from the Post & lintel construction Stylobate of Baekje. As a result of comparing the part composition and joining method of the pagoda body and the Post & lintel construction stylobate, it was confirmed that the Post & lintel construction stylobate influenced the construction technique of the pagoda body. In addition, differences in the way the Post & linte construction technique is applied depending on the location of the pagoda body of Stone Pagoda at Mireuksa Temple Site, Iksan were inferred. This study is significant in that it clearly reveals the origin of the unique construction technique of the Stone Pagoda at Mireuksa Temple Site, Iksan.