Abstract: Through the field and pot experiments, the impact of excessive solar ultraviolet (UV) radiation (280 ~ 400 nm) on the soybean plants, including stem pattern, physiological activity and yield, is investigated. Different responses to the three levels (0.15, 0.35, 0.70 W·m-2) of UV radiation are expressed of soybean production. The responses change with radiation intensity, various soybean species and environmental conditions. By studying the growth and physiological characteristics of soybean under the excessive UV radiation, several mathematical models are established to elucidate the differences of the two soybean specises. The results are satisfactory