The coking plant wastewater is a kind of industrial wastewater which is difficult to deal with. The main biochemical technique such as A/O and A2/O are used to deal with the wastewater. But after biochemical treatment, it still has very deep color and contains many kinds of pollutants. As a result, it cannot be discharged directly. Ultrasonic, electricity and Fenton′s reagent are used to oxidize the coking plant wastewater. This technology can efficiently decolor the wastewater from 1 000 times to 50 times, the total removed rate of CODCr is more than 80%, and the concentration many of other pollutants decrease greatly. Furthermore, the application of ultrasonic and DSA electrode will improve the effect of oxidation, reduce the dosage of Fe²⁺ and H₂O₂ and shorten the reaction time. Its foreground is good.