Abstract: Cadmium (Cd) and Chromium (Cr) are widespread heavy metal pollutants in soil. As a method to treat metal pollution in soil, solidification / stabilization has the characteristics of rapid, economic and effective. This experiment by rice husk biochar (BC) as raw material, using the beta cyclodextrin chitosan (β-CC) on the modification, formed a kind of cheap and environmental protection can effectively remove heavy metal ions in soil organic compound adsorption material beta cyclodextrin chitosan biochar (β-CC BC), after curing with Portland cement stabilizing Cd and Cr in the soil. The treatment effect of modified biochar was investigated by controlling single factor variable. The results showed that the leaching concentration of Cd and Cr was the lowest when β-CC BC was added about 10% and curing time was 21 days. Compared with potassium phosphate (K₃PO₄), calcium carbonate (CaCO₃), sodium silicate (Na₂O·nSiO₂) and sodium sulfate (Na₂SO₄), β-CC BC has better treatment effect on Cr and Cd. This study provides a new technical scheme for long-term simultaneous solidification and stabilization of Cd and Cr contaminated soil.