This paper aimed to identify the variation of layout in Hwangnyoungsa buddhist temple site based on studying published the excavation research paper and texts related to layout. According to earlier studies, in 1st construction period(553～569) of Hwangnyoungsa, there were trisection spaces with one main hall and two corridors in inner part and then in 2nd period(584～645), unified one. But actually trisection spaces had been maintained until the middle part of 8th century. And in each space there was the main hall with large yard. That is the 2nd period layout of Hwangnyoungsa. For the attainment this result, each building remains are judged under duplicated situation which one was the previous and next by consideration of the construction condition and special features of foundation. Although the meaning of trisection system of Hwangnyoungsa is similar with the layout of ancient palace, it could be said to derive from accumulation excavation research in Silla's archeological site and such studies.