Using data of national northern soybean’s regional experiment（mid-mature group） in 2004 as original material,the productivity and stability of "Jinong 17" and other 6 soybean were analyzed and compared by united variance analysis,F test,variable coefficient,regressed parameter and high stability coefficient.The results showed that it is accurate,assured and convenient to assess soybean varieties by using high stability coefficient."Jinong 17","P9231" and "Gongjiao 03-1212" are notable in increasing production and adaptability,and they are high and stable production soybean varieties.