Abstract: In this paper the sorption (desorption) behaviour of iodine on the concrete with the simulated groundwater and the sorption isotherm were studied. The value of distribution ratio RDa at 30±2℃,C1 = 10-6mol/l and pH=9. 01 was determined to be 3. 16±0. 32 ml/g. The effects on RD values of acidity, solid-liquid ratio,solid specific surface area and the reductant (Fe and (NH2)2) were also investigated.