Abstract: According to hard biodegraded phenols, romantic hydrocarbon, ammonia nitrogen and other toxic and harmful substances in the washing and cooling wa ste water of the coal gas from coal-gas generation station, those substances would cause great harms to the human and environment. The EF-Feox method was applie d to treat an actual coal gas washing and cooling waste water in a pilot test and individually to study the current, p H, H2O2 dose and other factors affected to the remo val effects. A central complex test with three factors and three levels was applied to the design of the response surface. A comprehensive considered economic factor a nd engineering feasibility were applied to asset up the optimized technical conditions. The results showed that when the p H was 4.0, H2O2 dosage was 3.0 m L/L, curr ent was 0.6 A, electrolyte Na CI concentration was 17 mmol/L, space between the polar plates was 100 mm and hydraulic retention time was3 h, a removal rate of the p henols from the waste water could be 92.82%. The removal rate of CODcrwould not be high, but the biodegradability ( B/C) could be improved from an initial 0.09 to 0.4 4 and could be suitable the pre-treatment of the biochemical treatment.