In this study, we conducted a field survey of Buddhist temples, Taoist temple, and Shrines with One bay tpye with under roof in Sichuan Province from 2010 to 2019. We surveyed and photographed a total of 12 buildings, including important cultural relics and well-preserved structures at the national, provincial, and municipal levels in the Ming Dynasty, and created a plan view, compared and examined the planes, frames, tokyous and ceilings, and clarified the architectural characteristics of the Buddhist temple with One bay type with under roof of the ministry.

 In this paper, we showed that Dimensional planning method of column interval was Shiwari-sei (枝割制), and Dimension of Kumimono (組物) was planed by Taruki-wari (垂木割) in the Zen style architecture. Then, we presented its concrete technique.

 In the conventional research, four methods of the column spacing dimensional planning of the Zen style building have been assumed: “Kansu-sei （完数制）”(the method of controlling the dimension between columns with the Syaku(尺), in principle.”), “Aita （アイタ）”(the method to control the dimension between columns by the width of Kumimono in Tsumegumi （詰組）), “ratio （比）”(the method that uses a simple ratio such as 3: 2 or 4: 3 between the central bay and the side), and “Shiwari-sei”(the planning method based on the distance between adjacent rafters, measuring from the center of the rafters, called "Isshi”.). Among them, Shiwari-sei has been considered to be relatively unimportant, because of the characteristics of the Zen style architecture such as the fan rafter, the Zen style Kumimono and Tsumegumi. However, it is pointed out that the Shiwari-sei is a precondition of Aita from the result of the Architectural technical book research. In addition, the almost Wayo style （和様） buildings had been planned by Shiwari-sei, and this style was the dominant style in the medieval period. And even in some remnants which considered planed by Kansu-sei, is compatible with Shiwari-sei. Based on these, in this paper, we examined the possibility that Shiwari-sei existed as dimensional planning method in the medieval Zen style Buddhist Halls. We analyzed following four buildings. Shohukuji Jizodo (正福寺地蔵堂, 1407), Seihakuji Butsuden(清白寺仏殿, 1415), Tokoji Hondo (東光寺本堂, before 1517), Okunoin Bentendo (奥之院弁天堂, Middle Muromachi).

 As a result, it was found that the column spacing dimensional planning for each building was designed by Shiwari-sei and the size of Kumimono was also planned by Taruki-wari. In addition to the Shofukuji Jizodo, where the use of the split system was pointed out conventionally, we found a concrete Taruki-wari plan that is latent in a building (Seihakuji Butsuden, Tokoji Hondo) that was previously considered unrelated to it. As the column spacing composition gets under the influence of Tsumegumi and the center bay and the side bay settles in a 3: 2 relationship, Taruki-wari was limited to Shiwari that could maintain this relationship. Its combinations were 19.5shi and 13shi at Seihakuji Butsuden and 24shi and 16shi at Tokoji Hondo. By fixing the number of rafters between columns in this way, the planning method changes, for example, to the technique in which the dimension of one branch is determined as a result of making the size of the center bay the Kansu. It was shown that the maximum width of Kumimono was determined based on the Isshi dimensions thus obtained. At the same time, we also shown that these dimensions could be easily and accurately obtained using the carpenter's square in those day.