Permeable reactive barriers(PRBs) is one of the alternatives to the pump and treat(P&T) for in-situ technology of contaminated groundwater.33 Zero Valent Iron(ZVI) is mainly used as the reaction medium for the PRBs and is non-toxic, abundant, cheap, easy to produce, and has a relatively high reduction potential.38 However, when ZVI is oxidized, the reduction efficiency decreases as time goes. To solve this problem, excavation is necessary to replace the ZVI or remove the oxide film. In this process, economic advantages are lost. In addition, PRBs may be limited in construction depending on the characteristics of the site, for example, if the depth of pollution is (30m or more) deep, economic feasibility may decrease. To resolve this problem, current study involves two ways; (1) the regeneration of oxidized ZVI with inorganic and organic acids in-situ and (2) synthesise of ZVI using iron minerals in soil. As a result of the oxidation of ZVI, the oxygen content of ZVI increased as the oxidation period increased, and the oxide species of ZVI was magnetite. In the dissolution experiment of ZVI and ferrous minerals, C2H2O4 minimizes the mass loss of ZVI and has the highest dissolution concentration of ferrous minerals, which is effective in ZVI synthesis. When the oxidized ZVI was regenerated for each regeneration agent, C2H2O4 showed the same reduction reactivity as non-oxidized iron, and the column and pilot experiments also showed higher reduction reactivity or the same. As a result of synthesizing ZVI after ionization with C2H2O4, magnetite had the highest synthesis rate among ferrous minerals, and ZVI was synthesized in column and pilot experiments using magnetite as a raw material. The synthesized iron showed high reduction reactivity to PCE(Perchloroethylene).