The exper iments on heavy co ncentration accelerator CBS wastewater have been conducted by adopting flocculation, ox idat ion, flocculat ion- adso rption and dist illation process. The exper imental results showed flocculation w ith FeSO4 , PAC, and Mg SO4 and ox idation with Fenton agent and flocculat ion- adsorption( FeSO4 , activ ated carbon) are little effective, but distillation is very effective. T he COD concentration is reduced fr om 50 000mg/ L to 3 300mg/ L and the total remov al efficiencies is up to 93. 4%, the colourity is decreased from 150 to 0. I t is suggested that the metho d can become an effective pre- treatment method.