The　effects　of　n-hexanol　on　the　micellization　of　quaternary　ammonium　dimeric　surfactants　(C-12-s-C-12　.　2Br,　s　=　3,　4,　6)　have　been　examined　using　conductivity　and　steady　fluorescence　measurements.　The　results　showed　that　the　critical　micelle　concentration　cmc　decreases　with　the　addition　of　n-hexanol.　The　larger　s,　the　stronger　the　effect.　The　dimeric　surfactant　and　n-hexanol　form　the　mixed　micelles　with　the　alkyl　chains　of　n-hexanol　molecules　penetrating　into　the　micelle　interior　and　with　hydroxyl　groups　lie　in　the　palisade　layer　of　the　micelle.　At　the　same　concentration　of　n-hexanol　in　aqueous　solution,　the　molar　fraction　of　n-hexanol　in　the　mixed　micelle　is　almost　the　same　for　different　s.　The　ionization　degree　of　the　mixed　micelle　increases　with　increasing　n-hexanol　concentration.