Micellar-enhanced　ultrafiltration　(MEUF)　is　a　promising　technology　to　remove　organic　contaminants　from　wastewater.　A　laboratory　experiment　was　carried　out　to　study　the　performance　of　four　Gemini　surfactant　systems　(CG(12),　CG(16),　CG(12)　+　Brij35,　CG(16)　+　Brij35)　for　treating　synthetic　wastewater.　The　results　show　that　CG(16)-Brij35　possesses　the　lowest　flux　behavior　and　the　best　rejection　efficiencies　toward　phenol　and　surfactants.　Pore　blocking　models　are　utilized　to　estimate　membrane　fouling　of　surfactant　systems.　For　CG(12)　and　CG(12)　+　Brij35　systems,　internal　pore　blocking,　intermediate　pore　blocking　and　cake　formation　models　occur　simultaneously.　Internal　pore　blocking　and　cake　formation　are　the　main　fouling　mechanisms　of　CG(16)　micelles.　With　respect　to　CG(16)-Brij35,　cake　layer　is　the　main　type　of　fouling　mechanism.　The　increased　pore　blocking　degree　follows　the　order　of　CG(12)　＜　CG(16)　＜　CG(12)　+　Brij35　＜　CG(16)　+　Brij35.　Furthermore,　SEM,　ATR-FTIR　and　a　mercury　porosimeter　are　used　to　analyze　membrane　surface　morphology,　membrane　material　characteristics　and　membrane　fouling　layer,　as　well　as　examine　and　verify　fouling　mechanisms.　Due　to　high　flux　behavior,　excellent　phenol　rejection　and　low　membrane　fouling,　CG(12)　is　a　more　desirable　selection.　Studies　output　helps　to　understand　the　fouling　mechanism　of　MEUF　in　the　presence　of　Gemini　surfactants,　and　gave　valuable　evidence　to　optimize　operation　strategies.