The total flavonoids in pretreated buckwheat seedling at different growing period were deter- mined by absorption spectrometry to obtain the change tendency.The results indicated that the total flavonoids content gradually increased as the buckwheat seedling growing.The total flavonoids content in the buekwheat seedling achieved maximum of 10.56 mg/g on the 17th day of growing period.Afterwards it gradually decreased within a narrow range.