The changing of glutamate decarboxylase (GAD) activities in the soaking and germinating soybean were analyzed in the experment.According to analysis of the changes of γ-amino butyric acid (GABA) content,GAD activity was defined.And the results showed that GAD activity which reached the maximum level after soaking at 25 ℃ for 10 h was 2.45 U.GAD activity which reached the maximun level after germinating at 30 ℃ for 40 h was 1.28 U.GAD activity in both the soaking-treated soybeans and germinating-treated soyb...