Ultrasonic method was used to extract soybean isoflavone, and antiphase flow injection chemilum-inescence was used to measure light intensity(I) that is a indicatrix of influence of several physical factors including state(solid, liquid), storage temperature, storage time and the concentration of the soy isoflavone liquid on soy isoflavone antioxidative activity. The results showed that in the determination time(30 d), solid affected by temperature was not obvious, while liquid was obvious, with temperature...