This study aims to analyze the standardization of the member size in Joudo-do, Joudo-ji as an inevitable preparation for the formation of the Daibutsu style, the new construction method invented by Chogen. 1）Through the calculation of the percentage ratio of timber volume and structural timber volume, 9 kinds of parts which are more than 3% of the percentage ratio of timber volume are found in Joudo-do, Joudo-ji. 2）The percentage ratio of timber volume of 9 kinds of parts in Joudo-do corresponds to 64.68% of total timber volume, while the percentage ratio of structural timber volume corresponds to 60.63% of total structural timber volume. These volumes are approximately 20 − 30% lower than those of Nandai-mon, Kaisan-do and Shoro, Todai-ji. 3）Therefore in Joudo−ji, Joudo−do there was not executed the standardization of the member size seen in Todai-ji.
