A native bacterial strain, named F7, with strong Cd resistance ability was isolated from Cd-contaminated soil. According to its morphological and biochemical characteristics and 16S rDNA sequences analysis, it was identified as Bacillus. The bacterial strain F7 could grow on the beef extract peptone medium that concentrated Cd²⁺, which can reach to 50 mg/L. The effects of initial Cd²⁺ concentration, pH and biosorbent dosage on Cd²⁺ adsorption efficiency were studied. And the adsorption mechanism of bacterial strain was explored by FTIR. The experimental results showed that the Cd²⁺ adsorption efficiency achieved 93.9% when initial Cd²⁺ concentration was 1.0 mg/L, biosorbent dosage was 1.0 g/L, and pH was 6.1. The biosorption equilibrium conformed to the Langumir equations and the maximum adsorption capacity was 1.83 mg/L. The functional groups on the cell wall of bacterial strain F7 before and after adsorption process were observed by FTIR, the results indicated that the main functional groups participated in Cd adsorption were—OH, —NH₂, —?CH₃, Protein amide Ⅱ and Phosphate group.