Abstract: A systematic study on wet air oxidation (WAO) of highly concentrated emulsification wastewater was performed in a 2 L high-pressure batch autoclave,with emphasis on the removal effect of CODCr,TOC and influence factors.The experimental results indicated that the temperature was the key factor and the best feasible temperature was 220 ℃,and that 86.4% of CODCr and 79.5% of TOC (initial CODCr 48 000 mg/L) in the wastewater were removed in 2 h.Oxidation was restricted without enough oxygen,it was fitting when the supply of oxygen was (1.0～1.25) p(O2)*.WAO had a good performance in the treatment of emulsified wastewater in a wider range.The pH of input water had little influence on the oxidaton efficiency.