Abstract: The changes of respiratory intensity,soluble protein,vitamin C,glutathione,total phenols,total flavonoids,anthocyanins,total antioxidant capacity,superoxide anion and hydrogen peroxide contents of Toona sinensis during cold storage were studied.The results showed that the respiratory intensity,the contents of superoxide anion and hydrogen peroxide increased gradually as the extension of storage time,yet the contents of soluble protein,vitamin C,glutathione,total phenols,total flavonoids and anthocyanins and total antioxidant capacity decreased gradually.The quality indexes of Toona sinensis treated with ozone concentration of 8.56 mg/m~3were better than those of other treatment groups.However,when the ozone concentration reached 12.84 mg/m~3,damages to Toona sinensis and were caused in addition to accelerating its aging and browning.