The effect of limonium bicolor decoction (LBD) (1%, 5%, 10%) on the life-span of bombyxmori was investigated. It was found that LBD could obviously prolong not only average life-span and average of highest life-span of both female bombyxmori and moth, but also the daration of female silkworm stage. Furthermore, LBD clud be antianoxiasis and hunger-resistant, these results showed that BLD could promise longevity.