In this work,relationship between the senescence of broccoli(Brassica oleracea L.Var.italica) florets and their changes in antioxidative level was investigated.Postharvest broccoli florets were stored at 20℃,and its indicators of senescence(chlorophyll,protein and malondialdehyde(MDA) contents) and antioxidative level(ascorbic acid and β-carotene contents,superoxide dismutase(SOD),catalase(CAT) peroxidase(POD) and ascorbate peroxidase(APX) activities) of flower buds were analyzed in continuous 4 days during the storage.With increasing of the storage time,chlorophyll and protein contents decreased,MDA content increased,ascorbic acid and β-carotene contents decreased,SOD,CAT and POD activities increased and APX activity decreased.These antioxidative level indicators showed linear correlation to senescence indicators at P=0.01.These results showed that senescence of postharvest broccoli florets is closely correlated to antioxidative level.