Abstract:The seeds of Leymus chinensis collected from different typical steppes in the Inner Mongolian Plateau in the same season were planted in campus of Fudan University, Shanghai and then their one-year-old seedlings were investigated. The changes of electrical resistance and conductivity in L. chinensis were measured after treated by polyoxyethylene glycols (PEG) of different concentration for six hours and twelve hours. The results show that the responses of electrical resistance and conductivity in L. chinensis from different geographic population was different. Using UPGMA, we found that those five geographic populations could be divided into three groups according to their changes in electrical resistance and conductivity. Among them, L, chinensis plants from Ji Lin and Ding Weizhan had strong resistance to drought, while those from Xiertala were weak . Those from A-Qi and Xiwu-Qi was intermediate.