Abstract: in order to determine an optimum technique to extract phenol waste water from fixed bed gasification with a solvent, a tributyl phosphate(TBP) as the complex was applied to study the different type diluents( sulphonated kerosene,petroleum ethe,benzene and octanol),soventand water ratio( extractant volume and waste water volume ratio) extraction series and pHl affected to the extracton effct.Meanwhile,a study was conducted on the alkali solution concentration,back extraction phase ratio and back extraction series affected to the extracion effect.The optimum extraction and back extraction conditions were determined.Finallyfrom a microcosmic vie w,the paper discussed the mechanism of the compex extraction process and determined the association mode of the complex extraction. The results showed the 40% TBP-60% octanol was selected as an extractant with pH≤ 7 and a solvent and water ratio 1 ∶ 3, after the four grade crossfiow extraction,the extraction rate was stablired over 91%.The NaOH concentration was 10% and the back extraction phase ratio was ≤1 ∶ 3.Aftr four grade cross-f1ow extraction,the back extraction rate was stabilized over 94%.Meanwhile, with the study on the extraction mechanism,the phenol extracted with TBP was found as a hydrogenassociation.