[en] Dynamic of sugar in organs of chrysanthemum was studied by ¹⁴C-sugar. The radioactivity of ¹⁴C-sugar supplied from the solution showed the maximum value in the leaf and then transported to the flower. An exogenous sugar was storage in the leaf, used as substrate of respiration and out put as ¹⁴CO₂. On the irradiated chrysanthemum, its transport was injured and ¹⁴CO₂ content was larger than that of non-irradiated them. The effect of irradiation and sugar treatment on the lipid composition and flow of biofilm of each organ of the leaf, stem and flower were studied. The results made clear that addition of sugar controlled decrease of flow (reduce of membrane activity). (S.Y.)