The　effects　of　n-propanol,　n-butanol,　n-pentanol　and　n-hexanol　on　the　micellization　of　quaternary-ammonium　dimeric　surfactant　C-12-2-C-12　.　2Br　have　been　investigated　using　conductivity　and　steady　fluorescence　measurements.　The　results　show　that　the　surfactant　and　the　alcohols　form　mixed　micelles　with　addition　of　alcohols.　In　the　mixed　micelles,　the　alkyl　chains　of　the　alcohol　molecules　penetrate　into　the　micelle　interior　and　the　hydroxyl　groups　lie　in　the　palisade　layer　of　the　micelles,　which　weaken　the　electrostatic　repulsion　between　the　ionic　head　groups　of　the　surfactants　and　result　in　a　decrease　of　cme　and　an　increase　of　the　ionization　degree　of　the　micelle.　The　effects　become　more　striking　with　increasing　the　alkyl　chain　length　of　the　alcohol　molecules.