Abstract: The influence of pH and current concentration on the dye degradation and decolorization were discussed with electrochemical steady-curve polarization.The experimental results showed that pH value would affect the direction of cathode reaction,electric potential of the electrode and degradation and decolorization effect of dyes.The acid solution is favorable to formation of H₂O₂ and has low electric potential of the electrode,but unfavorable to the follow-up flocculation.The neutral solution is efficient for degradation and decolorization of dyes,with COD_Cr removal higher than 80%. When the current concentration in the electrolytic tank reaches 0 5 A/L,the degradation and decolorization can be satisfactory.If the current concentration gets too great,by-products like hydrogen will be generated and the current efficiency of the reaction becomes lower.