Abstract: With the process of accelerative industrialization in China,serious environmental geotechnical problems were aroused as a result of the polluted foundation soil by industrial organizations.The property of the foundation soil was changed by acid and alkali pollution.The polluted soils with 4 different concentration of acid and alkali were artificially prepared.Influence on the fundamental physical properties of the polluted soil was studied,and the foundation soil polluted by different concentration of acid and alkali was evaluated,including the influence of concentraction of acid and alkali on the organic content,the specific weight of soil particles,the granulometric composition and the limit moisture content of the polluted soil.Some useful conclusions were drawn.It was shown that the organic content,the specific weight of soil particle and the liquid limit decreased but the plastic limit increased with the increase of the concentration of acid.The specific weight of soil particle,the liquid limit and the plastic limit decreased but the organic content increased with the increase of the concentration of alkali.Washing acid and adding sodium hexametahposphate in soil granulometric analysis tests for the dispersion of soil polluted by acid were suggested.