The grass carp scale contains abundant collagen.The hydrolyzed collagen is of many functions.In order to apply the theory in further research of grass carp scale,protein from grass carp(Ctenopharyngodon idellus)scale were hydrolyzed by Pepsin(HPe) and Papain(HPa) with different(1h,6h) hydrolysis time.In the meanwhile,its functional properties and antioxidant activity were investigated.The result showed that HPe and HPa had high solubility and heat stability,especially HPa whose solubility was higher than 91.60%.As the DH rising,the solubility increased while emulsion activity index and foaming capacity decreased of both HPe and HPa,and HPe possessed a better emulsion activity index and foaming capacity than HPa.Between the two kinds of HPa separated by different DH,the metal chelating activity,the reducing power and DPPH radical scavenging activity all decreased as the DH rising.In conclusion,the functional properties and antioxidant activity of protein hydrolysates from grass carp scale were influenced by the DH(P<0.05).