[en] Magnetically modified fodder's yeast (Kluyveromyces fragilis) cells using water based magnetic fluid, were characterized by scanning electron microscopy (SEM) and Vibrating Sample Magnetometer (VSM). The sorption-desorption properties of Sr"2"+ by these yeast cells from nitrate salt of Sr"2"+ were studied. The results demonstrated that the Sr"2"+ sorption volume by these cells enhanced with increasing pH and reached a plateau between pH 4.0 and 7.0. A minor effect by temperature was observed. The sorption volumes are 19.5 mg/g and 53.5 mg/g from 10 ppm and 40 ppm Sr"2"+ solution respectively within 20 min. The sorption of Sr"2"+ in these cells can be desorbed under 0.1 mol/L HNO_3 solution. The maximum Sr"2"+ sorption volume is 96.7 mg/g at 20℃. The sorption characteristic fits Langmuir model well with 140.8 mg/g calculated maximum sorption volume by these yeast cells. (authors)