Contact glow discharge electrolysis is a novel type of electrochemical process. Effects of catalyst and pH value on the degradation of o-chlorophenol in aqueous solution with contact glow discharge electrolysis plasma were studied. The experimental data showed that degradation benefits from basic condition, Fe2+ had a remarkable catalytic effect on degradation. The concentration of intermediate products and o-chlorophen 01 changed by time were analyzed by a high performance liquid chromatograph (HPLC).