Treatment of pulping wastewater by using a novel electrochemical reactor,i.e.the three phase fluidized bed electrode,reactor were invesigated.The effects of air flow rate,applied voltage,pH value and FeSO4 concentration on electrolysis efficiency were investigated.It was clearly shown that the 20 V of voltage,0.3 m3·h-1 of air flow rate,1000 mg L-1 of FeSO4 concentration and pH≈2.5 were its best conditions.COD removal could be 70.1% under these conditions.