Abstract: Objective To study the health protective function of lecithin on skin.Methods Using lecithin extracted from brain tissues of mammals,adopting the skin test-external application.Taking content of skin moisture,the levels of lipofuscin and LPO as targets.Results The content of skin moisture in test group were significantly higher than those in control group,the levels of lipofuscin and LPO in test group were significantly lower than those in control group.Conclusion The lecithin could play a very important role in the stable state of skin.