Cr(Ⅲ) removal in solutions with different pH values was measured under conditions of adding and without adding soils and minerals.With pH increasing in soil solution,the amounts of Cr(Ⅲ) removal by adsorption and precipitation increased when pH<10.5,but decreased when pH>10.5.The curve of Cr(Ⅲ) removal by soils and minerals could be divided into four ranges:(1)pH range of Cr(Ⅲ) adsorption when pH10.5.Organic acids such as citric acid and fulvic acid existing in soils would raise Cr(Ⅲ) dissolubility and stability in pH range of 4-7.The pH value causing precipitation of fulvic acid-Cr(Ⅲ) was about pH 7.0 and rose by 3 pH unites compared with that of Cr(Ⅲ)precipitation.Whereas,little effect on Cr(Ⅲ) dissolubility was found for humic acid existing in soil solution.The existence of phosphate in solution would lower the pH value causing stable precipitation of Cr(Ⅲ).The amounts of Cr(Ⅲ) adsorhed by three soils at pH 4.0 followed the sequence: stagnogleyed paddy soil)subme rgic paddy soil from red soil>upland red soil.Cr(Ⅲ) adsorption isotherms fit Langmuir and Freundlich equations in the montmorillonite-Cr(Ⅲ) system,but did not fit Langmuir and Freundlich equations in the soil-Cr(Ⅲ) system.