Compared with 13 North America standard varieties（MG0~MGⅢ）, the growth periods of 25 varietiesfrom different ecological areas in Northeastern China were studied. The results showed that although there were dif-ferences of growing period, all the controls could mature regularly in tested years. Most of tested varieties were sub-ordinated to MG0, others were subordinated to MG Ⅲ, MGⅠ,MGⅡ.‘Chidou 1’and‘Chidou 3’, bred by ChifengComprehensive Soybean Experimental Station, were subordinated to MGⅠ and MGⅡ. The experiment made clearthe growth period classification of soybean varieties in Chifeng, which provided the reference for not only validation,breeding and promotion in different regions, but also the establishing of soybean MG system and regionalize produc-tion regions in China.