There are two main parts in this article. Al-Ferron timed complex colorimetric method is used to study the effect of the speciation characteristics when solid polyaluminum chloride(PAC) is dissolved in magnetized water and the change of the speciation characteristics when liquid polyaluminum chloride is magnetized. The results show that when solid polyaluminum chloride is dissolved in magnetized water, the concentration of Alb is improved. For the magnetized PAC, the concentration of Alb is improved too. At the same time, the flocculation characteristics of magnetized PAC are studied by jar test. The result shows that magnetization has effect on the speciation characteristics of PAC and improve the flocculation efficiency.