It is better to obtain rice protein isolate from rice by purification than by alkali extraction．Because the product of alkali extraction is deep in color ,receive is low ,the amino will be damaged and toxicant together．On the othe hand ,protease extraction is geniality ,nutriment will be protect and little toxicant．Compare with the alkali extraction, protease extraction needs less time．Protease were very important in the extraction of rice bran protein．Rice protein hydrolysates can be used to not only improve quality of food in the structure and components，but also make special active peptide．
