AWATA no Mahito and other Japanese envoys, who returned to Japan in 704 after experiencing a significant shock during their visit to Tang, reported the differences of the capital cities and Ritsuryo system between Japan and China, and their report was taken in earnest by the Emperor Monmu's administration in order to carry out the reform.
大きな衝撃を受けて慶雲元年に帰国した粟田真人らは、これらの日中の都城や律令制の差異を報告し、文武朝の改革に生かされていく。