Abstract:The changes of proteins in cut flowers of five cultivars of lily (Lilium spp.) during senescence were studied using the improved polyacrylamide gel electrophoresis (SDS-PAGE). The results showed that there were some similar protein bands, i.e. 49.9 kDa、45 kDa、32.8 kDa、22.1 kDa, in five lily cultivars, but there also were clear difference among the varieties, for example, the band of 38.4 kDa was characterized for ‘Aziatische Gr. Yelloween’, ‘Longiflorum’ with 40 kDa, but no 26.5 kDa. However, the similarity of protein band between the same hybrid strains was obviously higher than that between different ones. During the process of senescence, the contents of some protein decreased constantly, but some keep stablity. There were new protein bands occurred during petal degrade stage, such as 58.3 kDa for ‘Oriental Gr. Siberia’, ‘Oriental Gr. Sorbonne’, and ‘Aziatische Gr. Yelloween’, 67 kDa for ‘Aziatische Gr. Trompeten’. It suggested that these specific proteins were related to petal aging possibly.