Root system plays an important role in the growth the plant, but the research on soybean root system is very limited. In pot experiment, we studied the differences of root characteristics among soybean varieties, which had different traits and belonged to different ages and regions. The 43 soybean varieties tested came from Heilongjiang and Jilin province. The purpose of the study is to recognize the differences of root characteristics and to reveal the evolutionary trend of root system among different kind...