The purpose of this study are that analyze proportion system of pagodas had been built in earlier and later 9C to study of pagoda in later period of unified Shilla dynasty and that know pagodas of change in the course of years and restore pagoda in later period of unified Shilla dynasty. It has been already proved the fact thai Three-story stone pagoda of Bulguksa Temple and Three-story stone pagoda of Silsangsa Temple was used Tang-scale in architecture. Three-story stone pagoda of Sunamsa Temple and Three-story stone Pagoda of Geumdunsa Temple in later period of unified Shilla dynasty were proved Tang-scale was used in architecture in the result of study using unit was used at that time. As is proved in analysis for plane and elevation, could know that Three-story stone pagoda of Bulguksa Temple and Three-story stone pagoda of Silsangsa Temple fixed proportion system is seen about proportion of flat stone in foundation stone and 1floor-tapsin but In earlier and later 9C pagoda porportion system was disordered.