The extending lifetime rate of the high dose,middle dose and low dose of Morus slba L.Chitooligosaccharides were 88%,77% and 79%,that of 5-Fu was 55%.

• 高、中、低剂量的桑白皮低壳聚糖的生命延长率分别为88%25、77%25和79%25,5-Fu的生命延长率为55%25。