In the germination process of mung bean, it was found that TPC (52.82–82.94%) and TFC (6.62–14.89%) contributed the most to the total antioxidant activity. The contribution of TPC decreased sharply on the second day,and then it slightly varied between 55.76 and 64.71%. As to soybean and black bean, there was a similar tendency of contribution like in mung bean. The highest contribution rate of soybean TPC occurred on Day 6 (63.60%), at the same time the peak contribution rate of black bean was 55.63%. As the germination progressed, the sum of relative contributions of TPC and TFC reached a maximum of 90.31, 69.7, and 63.27% corresponding to mung bean, soybean, and black bean, indicating that TPC and TFC contributed the highest percentage of total antioxidant activity, which was verified in the same report by Fernandz-Orozco et al. (2008).