Abstract: Five different iron salts for modified activated carbon, iron salts supported on activated carbon (GAC-Fe) was synthesized in infiltration, the GAC-Fe were characterized through X-ray diffraction (XRD) and Fourier transform infrared spectroscopy(FTIR).The effect of different pH and initial ClO₄^- concentration adsorbed perchlorate, adsorption isothermal models and kinetics were studied, and its reaction mechanisms was assessed.The results showed that the removal of ClO₄^- was best when FeCl₃supported on activated carbon, removal rate was 97%;the removal rate of ClO₄^-under the condition of weak acid and neutral was better, adsorption isotherm experiments showed that describe the composite material adsorption of ClO₄^- process Langmuir model better than Freundlich model; adsorption kinetics result showed that the adsorption of ClO₄^- of composite material(GAC-FeCl₃) more in line with the pseudo-secondary dynamics equation.