Changes in antioxidant compounds and antioxidant activity were studied in soybean seeds during germination applied gibberellic acid (GA₃) in soaking water. GA₃ concentrations in soaking water were set up as 0; 0.001; 0.01; 0.1; 1 and 10mg/L. The soaking process was carried out at ambient temperature for 12 hours prior germination. Soaked soybeans were germinated in dark condition, at 25^oC for 0, 12, 23, 36, 48, 60 and 72 hours. The total phenolic content (TPC), total flavonoid content (TFC), vitamin C and α-tocopherol contents as well as antioxidant activity assayed by DPPH radical-scavenging activity in terms of IC50 of germinated soybean were determined. It was found that, the increase of germination time caused an increase the TPC, TFC, vitamin C, α-tocopherol as well as antioxidant activity and most of them tend to reach the maximum values after a period of 60 hours of germination. In addition, GA₃ has a profound effect upon the antioxidant potentials and it caused a significant enhancement in the production of antioxidant compounds when compared to control. GA₃ 1mg/L in soaking solution was proposed as optimum concentration to apply for soaking process.