This manuscript is to clarify the reason that cherry blossoms settle their place as the representative of flowers and describe themselves mainly as waning shape in Kokinsue(古今集) times through the history of Waka(和歌) and Chinese poems (漢詩). Jowagi(承和期) is widely known as the transition period, and in each poem of this age, especially in Shimadano Tadaomi(嶋田忠臣)`s poetry Denssikasyu(田氏 家集) many examples of cherry blossoms appear compared with the previous age. And Chinese poems reciting these cherry blossoms recognize this flower as a easily waning flower. Thus, it is thought that cherry blossoms received attention as the materials of Chinese poems by the inflow of Chinese poems by Chinese Tang poets including Baekgeoyi(白居易). And we analyzed Manyosyu(万葉集) and Chinese poems, Chokusensandaisyu (勅撰三代集), pointed out that expressing the vanity of life through withering flowers is the common ground of the expression of both countries, and clarified that the discovery of this common ground became the opportunity to associate cherry blossoms and fallen blossoms. This means that the expression of Waka(和歌) and Chinese poems has been absorbed in Japanese Chinese poems, then it leads to the creation of new Waka expression in Kokinsue times.