The crosslinked polymer beads was synthesized by free emulsion polymerization using maleic anhydride and styrene. The chemical structure and morphology of the polymer beads were analyzed using FTIR and SEM. And the dynamic adsorption properties of beads for Pb(Ⅱ) was studied by atomic adsorption spectrometry(AAS). The relevant factors influencing adsorption and desorption were investigated. The results showed that in the solution at pH 5, when the sample flow rate was 1.0 mL·min-1, the adsorption rate of Pb(Ⅱ) reached more than 95%. Using 1 moL·L-1 nitrate acid as the best eluant the absorbates were desorbed at the flow rate of 0.5 mL·min-1, the recovery of Pb(Ⅱ) reached more than 99%. Under the optimum conditions, the adsorption capacity could be up to 26.5 mg·g-1, the detection limits(3σ11)were 2.1 μg·L-1 and relative standard deviation (RSD) was 2.5%. The method has been applied to the determination of trace lead in water samples with satisfactory results.