Abstract: The purpose was to discuss the effect of different NO3^-/NH4^＋ ratio （10：0,7：3,5：5,3：7,0：10） on Cadmium content and physiological indexes of plant under Cadmium stress. [Method]With Chinese white cabbage as tested material, effect of NO3^-/ NH4^＋ ratio on the growth, Cadmium content and contents of total nitrogen, total carbon under Cadmium stress （1 mg/L） were studied on the basis of Hoagland nutrition. Under Cd stress（ 1 mg/L）, hight of plant was the highest at a 5：5 ratio,and lower than the control;Above-and belowground biomass arrived at peak value at a 7：3 ratio,but root/shoot ratio was not significant difference among treatments.Pn and Te showed a trend of increasing firstly and reducing again with increasing of NH4^＋ eoncentration, and there was the highest at NO3^-/NH4^＋ ratio of 7：3,while the changing pattern in Ci was contrary to Pn. With increasing of NH4^＋ concentration,content of total carbon aboveground elevated, and contents of total carbon belowground in each treatment were higher than that of the control.Contents of total nitrogen aboveground reduced with increasing of NH4^＋ coneentration,and contents of total nitrogen in each treatment were lower than that of the control.Content of Cd aboveground has a trend of increasing with adding of NH4^＋coneentration,and there was the lowest content at NO3^-/ NH4^＋ ratio of 7：3,but content of Cd belowgroun was higher than that aboveground.Shoot of Chinese white Cabbage had less absorbed to Cd at NO3^-/NH4^＋ ratio of 7：3 under Cadmium Stress（1mg/L）;Shoot of Chinese white Cabbage absorbed more Cadmium at more NH4^＋ concentrations.