The accumulation of Cd in brown rice as affected and predicted by Cd concentrations of soils and soil properties was investigated by pot experiments with eight different paddy soils with a wide range of Cd concentration (0.20-6.27 mg/kg). Compared with the control, no toxic symptom was observed when rice exposure to high Cd concentrations. Based on national maximum levels of contaminants in foods (GB 2762-2012), Cd threshold values of the studied paddy soils were derived to be 0.70-4.79 mg/kg, all of which exceeded the guideline values in national soil environmental quality standard (GB15618-1995) (0.3 mg/kg when pH≤7.5 and 0.6 mg/kg when pH>7.5). The multiple regression analysis showed that there were significant positive correlation (R²=0.83, P<0.01) between soil pH, clay content and the threshold values of Cd to brown rice.