Abstract: Cecropins of Antheraea pernyi pupae is a kind of broad-spectrum sterilizing substances constructed by 35 amino acids. It is induced from the organism of the antheraea pernyi pupae by immune ways. It has no toxic and side effects on the bodies of humanbeings and livestocks since it can be hydrolyzed by the protein enzymes easily. The experiments indicated that the cecropins has obvious sterilizing effect on many kinds of G+ and G- bacteria. It has great advantages on the preservation of acid foods for its higher effects in the acid circumstances. It has high solubility and stability and remains quite active at high tempratures. The action mechanism is to sterilize the microbes while common chemical preservatives only have antimicrobial affects. The cecropins is a new type of food preservative and has boundless prospects.

Key words: Antheraea Pernyi Cecropins Preservative