Abstract: In this article ,the precipitation conditions of extracting phosvitin from egg yolk were discussed .In our experiments,the water soluble proteins except phosvitin were removed first then the lipids were removed and at last ,the phosvitin wasisolated from the resulted granules with NaCl solution.Meanwhile, the affecting factors such as amount of water , species oforgano solvent , amount of solvent, NaCl solution and concentration of were studied.The optimal processing conditions wereobtained by orthogenesis test, which provided a foundation for the scale-up batch process.Key words

Key words: Phosvitin , N/P , Extract