Arsenic, one of endocrine disrupters, is vety toxic, so that contaminated soil with arsenic can cause many problems for human beings. However, standardized remediation process for the soil contaminated with arsenic is insufficient due to characteristics of its anion-mobility and speciation changed by Eh-pH of soil. One of the well-known efficient remediation processes is the modified soil washing that particle separation process by only water. However, it is required that the treatment plan for the fine soil what was discharged after modified soil washing. Therefore, this research suggests the treatment plan that the recycling method using arsenic immobilization by FeS-H2O2, The batch experiments results for the arsenic immobilization showed that the water content was at least 50%, the injection of FeS and H2O2 (assay-35%) were 8% (w/w at dry base) and 0.2mL/10g of fine soil respectively. Arsenic concentration with KSLT was decreased about 95.4%. The results indicated that the mixing of FeS-H2O2 was highly efficient on the immobilization of As-contaminated soil.