Aiming　at　choosing　a　feasible　extractant　for　N,　N-dimethylfonnamide(DMF)　wastewater　treating,　liquid-liquid　equilibrium(LLE)　data　of　ethyl　acetate-DMF-water　ternary　system　were　determined　at　30,　35,　40,　45　and　50°C　under　atmospheric　pressure.　The　activity　coefficient　models,　NRTL　and　UNIQUAC,　were　used　to　regress　the　LLE　experimental　data.　Empirical　equations　of　model　parameters　with　temperature　were　obtained.　The　experimental　data　were　represented　satisfactorily　by　using　UNIQUAC　model.　Calculated　compositions　based　on　UNIQUAC　model　were　found　to　be　in　good　agreement　with　the　experimental　data.　Total　mean　absolute　deviation　of　temperature　was　0.0310,　and　the　maximum　mean　relative　deviation　for　the　compositions　was　0.0179.