Oxygen gas diffusion electrode is one of the key factors of electrochemical CO2 concentrator,therefore,further studies on catalytic ability of O2 electrode are beneficial to increasing of CO2 transfer index and velocity.Preparing process of the oxygen gas diffusion electrode is improved by means of the pretreatment of active carbon and the selection of preparing method of Pt/C powders.Based on analysis of orthogonal experiment results,the optimum preparing conditions of PL/C powder in O2 electrode are achieved in this paper.