The adventitious buds of orential lily "Sorbonne" were treated with ,60,Co γ-rays at doses of 0, 0.5, 1.0, 2.0, 4.0, 6.0 and 8.0Gy respectively. Effects of ,60,Co γ-rays irradiation at different doses on growth and physiological characteristics of adventitious bud of oriental lily have been studied. With the increase of irradiation dose, MDA content and plasmalemma permeability in adventitious bud of oriental lily increases. Superoxide anion (O,2,-,) content and catalase (CAT) activity in adventitious bud of oriental lilies which are treated at doses of 2.0, 4.0, 6.0 and 8.0Gy is higher than that in the control group, and germination rates are less than that of the control group. The increment of height of buds which are treated at doses of 4.0, 6.0 and 8.0Gy respectively is less than that of the control group. The results show that ,60,Co γ-rays irradiation has the inhibiting effect on the growth of adventitious bud of oriental lily. It can be concluded that the optimum irradiation dose range is from 2.0Gy to 4.0Gy, and LD,50, range is from 4.0Gy to 6.0Gy.