As　an　additives　in　plastics,　di-(2-ethylhexyl)　phthalate　(DEHP)　enter　the　environment　during　the　production　of　plastic　and　plastic　material　or　after　disposal.　Although　the　concentrations　of　DEHP　in　water　bodies　are　low,　it＇s　carcinogenic　and　exhibit　adverse　reproductive　effects.　This　article　presents　a　method　for　DEHP　determination　in　water　and　removal　performances　of　biological　aerated　filter　from　secondary　treatment　sewage　effluent　are　also　evaluated.　All　results　show　that,　DEHP　is　widespread　distributed　in　Chinese　water　bodies.　When　the　turbidity　or　suspend　solids　in　water　are　high,　we　need　to　filter　the　water　for　precise　determination.　Biological　aerated　filter　showed　a　desirable　removal　rate　when　it　used　to　polish　the　secondary　treatment　effluent.　Within　the　influent　DEHP　concentration　20　mu　g/L,　the　effluent　DEHP　concentration　of　biological　aerated　filter　could　meet　the　demand　of　Chinese　GB/T19772-2005　standards.