The　mixed　adsorption　of　a　cationic　gemini　surfactant,　ethanediyl-1,2-bis(dodecyldimethylammonium　bromide)　12-2-12),　and　a　nonionic　surfactant,　polyoxyethylene　mono-dodecyl　ether　(C12En,　where　n　=　4,　10,　23)　at　the　air/water　interface　was　studied　using　surface　tension　measurements.　The　dilational　viscoelastic　properties　of　the　films　that　formed　at　the　air/water　interface　were　examined　using　an　interfacial　rheology　technique　that　was　described　using　the　Lucassen-van　den　Tempel　(LVT)　model.　The　values　of　the　limit　elasticity　were　fitted　accordingly.　Foams　were　generated　by　the　mixed　surfactant　aqueous　solutions　and　the　stability　of　foams　determined　using　the　half-life.　C12En　exhibited　attractive　interactions　towards　12-2-12　within　the　adsorption　films.　The　average　minimum　area　(A(min))　of　the　adsorbed　molecules　decreased　in　the　order:　12-2-12/C12E23　＞　12-2-12/C12E10　＞　12-2-12/C12E4,　while　the　limit　elasticity　decreased　in　the　reverse　order:　epsilon(0,　fit)(12-2-12/C12E4)　＞　epsilon(0,　fit)(12-2-12/C12E10)　＞　epsilon(0,　fit)(12-2-12/C12E23)　at　a　comparable　concentration　of　the　surfactant　in　the　bulk.　Compared　with　the　film　adsorbed　by　12-2-12　alone,　only　12-2-12/C12E4　form　had　denser　structure.　Thus,　by　adding　the　nonionic　component　C12E4,　which　contained　a　small　hydrophilic　head　group,　the　interfacial　elasticity　of　the　12-2-12　film　increased　significantly　and　the　stability　of　the　corresponding　foams　was　effectively　enhanced.