This article explores the principle employed in the construction of stone pagodas during the eighth century of the Silla period. It focuses on eight stone pagodas believed to have been built based on the identical construction principle among 20 pagodas that share typical Silla style. The pagodas’ sizes and the dimensions of their materials have been converted to the Tang unit measurement ( Tang chi, 唐尺) at the time of construction according to accurate measurements published in a recent report. Based on this, I was able to study the eight pagodas and also find their art-historical meaning. The following is the summary of my findings. First, the principle’s basic module as applied to the eight pagodas is half of the width of the bottommost base stone (which determines the pagoda’s total height), the platform’s height, and the cover-stone’s width. In the case of the body part, the pagoda’s first story is affected by the platform, which means that the stone roof ’s width as well as the height and width of the stone for the first story are determined by the width of the upper stylobate. The width of each stone roof at the second and third stories is 1.0 Tang chi narrower than that of the story below, which eventually determines the height of the stone roof and the height and width of the body. This principle helps to estimate what comes first when designing the pagodas’ subsidiary materials. This type of principle is evidence that supports the actual existence of a design protocol rather than the design and construction of a stone pagoda every time one was requested. The fact that some pagodas constructed on the same principle are found in Gyeongju, Cheongdo, Changnyeong, and Gimcheon implies the existence of blueprints as well as a group of artisans who were aware of this principle of construction. The circulation of the principle through the group’s interactions can be corroborated by exchanges among the temples from which the eight pagodas were built. This can supplement previous studies on the pagodas. Moreover, six pagodas out of the eight share not only the same construction principle but also the same size. Even though they must have been constructed based on different project sizes and also in different regions, the fact that the dimensions of the pagodas are almost identical suggests there was a partial change in designs in the temples of the Silla from earlier centuries. I expect this article about the construction principle used in the Silla pagodas is to add to the previous studies on the pagodas, and also to apply to the reconstruction of collapsed pagodas or to identify prototypes of the modified or missing materials.