Abstract: 131I uptake rates of control group, which stop eating salt with iodine for over six weeks, eating salt with iodine group, the hyperthoidism group are determined in 2 h, 6 h and 24 h spectively. The results show 131I uptake rate of eating salt with iodine group are (7.7±4.2)% in 2 h, (13.8±5.3)% in 6 h and (21.9±7.7)% in 24 h. There are no difference between sex. There is signifcance of difference (P<0.01) between eating salt with iodine group and control group. Overlapping rate of 131I uptake rates between the hyperthroidism group of eating salt with iodine and control group is 50%, and eating salt with iodine group is 22.5%. To determine the thyroid iodine uptake rate in the patients who did not stop eating salt with iodine, the ranges of normal values must be definited. This result could be as a standard to diagnose the patients of hyperthyroidism of eating salt with iodine.