Abstract:One-year static cultivation experiments were conducted to investigate the effects of fish bone meal on immobilization remediation of cadmium (Cd), basic physiochemical properties and enzyme activities in acid and alkaline Cd contaminated soils. The results showed that with the increasing of fish bone meal amount, the pH, organic matter and cation exchange capacity increased in acid and alkaline soils, while the water content decreased by 2.90%~6.19% and 0.10%~1.81% compared with the control. The extractable Cd content of the TCLP (toxicity characteristic leaching procedure) in soil decreased with the increasing of fish bone meal, which decreased by 49.7% and 17.0% at most, respectively, when compared with the control. After the addition of fish bone meal to alkaline soil, the activity of catalase increased significantly (p<0.05), while the peroxidase activity was restrained, and the urease activity was promoted only under the treatment of addition fish bone meal less than 1%. However, in the acid soil, the activity of catalase, peroxidase and urease increase by 90.5%, 65.4% and 75.8% at most, respectively. The number of organic carbon functional groups was changed after applying fish bone meal, and the content of phenolic compounds, aliphatic C and aromatic C increased. The content of available Cd in soil was extremely negatively correlated with the organic matter content and the catalase activity (p<0.01), and it was obviously negatively correlated with pH and cation exchange capacity (p<0.05). Therefore, using fish bone meal was efficient for remediation of Cd contaminated soil.