This paper aims at examining the doublet and the Manyou Kanas of Ancient Chinese dentals and supradentals in Yamanoueno Okura\s poems He had stayed in Tang for two or five years in the early 8th century when Ancient Chinese was undergoing its great shift in initials and finals So, he may have known very well the sound changes in Tang era But Kazuo Mabuchi insists that Okura..