Abstract: The best technology of preparing low-molecular weight peptide from scale by enzymatic hydrolysis has been introduced. Using mixed enzyme is better than other enzymes. Tow methods of removing fishness and bitlemess are compared, which shows that adding compound decolorer is better than andding pure carbon. Ultrafiltration and reverse osmosis membrane sepatation technique can sublimate and concentrate the hydrolyzed liquor. The product is a kind of healthy food which contains many low-molecular weight peptides.

Key words: scale, Multi-stage enzymatic hydrolysis, low-molecular weight peptide