The electrokinetic remediation is a technology applied to remediate a fine-soil. In this study, the feasibility of the technology was investigated by adapting fine soil after soil washing process contaminated by arsenic. Anolyte conditioning with NaOH on electrokinetic remediation of arsenic-contaminated soil was investigated in the laboratory. Chelating agent was used for As-metal bound to destruct in soil in batch-test. As a result, EDTA is more efficient than Citric Acid (CA) from chelating capacity of Fe, Al and ability of desorption of As when the molarity is 20 mM. Sequential extraction was performed to confirm fraction of Fe-As and Al-As oxides by Onken method. Arsenic-contaminated soil which was mixed with 20 mM EDTA of liquid limit of 120% was filled in lab-scale pilot. Four lab-scale EK(Electrokinetic)-systems were operated for 408 hours. Tap water, 0.025 N, 0.03 N and 0.1 N NaOH are used for anolyte. After experiments, soil in the cell was sliced into 5 sections and each section was used to analyze As-concentration. As a result, removal efficiencies of arsenic were : 21.48% for EK-1, 35.26% for EK-2, 50.33% for EK-3, 67.43% for EK-4.