Abstract: Through adding sepiolite in the heavy metals contaminated soil for the correlation of pH value and heavy metals of the soil, the form of heavy metals in soil was analyzed, and study on the relationship between pH value and heavy metals forms of the soil. The results showed that sepiolite could significantly improve the pH of the soil and reduce the concentration of exchangeable fraction of heavy metals, which made the exchangeable form transform into other forms. The exchangeable form of heavy metals Cd，Zn and Pb in soil and pH values were in significant negative correlation. Except the Fe-Mn oxide form and organic forms of Zn, the carbonate form, Fe-Mn oxide form, organic forms, residual forms concentration of Cd、Zn and Pb were positively correlated with the soil pH value. The concentrations of heavy metals in plant and pH in soil were significant negative correlation. The study results showed that sepiolite can significantly change the soil pH value and soil heavy metal forms and there was a significant correlation between heavy metal pollution and pH value of soil.