Abstract: To ascertain whether transgenic engineering will affect resistance of seeds and seedlings to stresses,and consequently provide first-hand scientific information for environmental safety assessment of transgenic soybean,comparative studies were conducted in laboratory and greenhouse on transgenic soybean ARG,it′s counterpart n-ARG and Su 3 a traditional soybean cultivar in China.Results show at the germination stage,ARG was much weaker than n-ARG and Su 3 in resistance to high temperature and water stress,and similar to n-ARG but weaker than Su 3 in resistance to salt stress.At the seedling stage,given temperature stress(high-40 ℃,low-15 ℃)and water stress(flood and drought),ARG showed no advantage in height and biomass,and on the contrary,some disadvantages in certain conditions.For example,under a slight drought(relative water content 55%),ARG was obviously less than n-ARG in dry weight of the overground part,and also weaker than n-ARG and Su 3 in salt tolerance.The research shows the herbicide-tolerant transgenic soybean ARG is rather weak in competitiveness and invasiveness under stress conditions.