Total enzyme addition,pH,enzymatic hydrolysis temperature and ratio of sample to solution were selected to determine the factors and levels by single-factor test method and the orthogonal test method with the hydrolysis property.The optimized enzymatic hydrolysis conditions with the Alcalase were as follows: total enzyme addition 7%(w/w),pH 10.0,enzymatic hydrolysis temperature 60℃,sample to solution 1∶25,enzymatic hydrolysis time 2h.Under these conditions antioxidative activities of hydrolysates at different hydrolysis property as high、middle、low are analyzed.The results are as follows: hydrolysates at different hydrolysis property have good ability to eliminate the DPPH,·OH,O~-_2·,and the reducing power is strong.