Catechin has anti-oxidation function which is 4-6 times better than synthetic anti-oxidants BHT, BHA,6-7 times of VE, 5-10times of Vc. Just adding 0.01%~0.03% content can take effect, but has not potential toxic side effects as synthetic. The synthetic anti-oxidants, BHT, BHA, etc. have been strictly prohibited in many countries and areas. It is the general trend and popular fooling to use the natural, safety and highly efficacy product for replacing synthetic. Catechin has a strong protective effect against colour and vitamin in the food for long time, for this reason the food can remain original colour and vitamin in the food for long time , for this reason the food can remain original colour and luster as well as nutrition, and can effectively prevent deteriorate and eliminate peculiar smell of edible oil. In addition Catechin has remarkable effect on inhibition and elimination of virus and pathogens, and on detoxification for poisoning of heavy metal sait and alkaloid. The antibiotic ability of Catechin is 4-10 times strong as scutellarin. For radicalization and ultraviolet ray is has function of protection and filtration also