Conductivity　is　important　in　the　investigation　of　the　micellization　behavior　of　ionic　surfactants　in　an　aqueous　solution.　We　review　this　sensitive　technique　and　discuss　methods　to　determine　the　critical　micelle　concentration　(cmc)　and　the　degree　of　dissociation　of　the　micelle(α)　in　detail.　We　also　investigatea　special　situation　analysis　for　conductivity　curves　and　premicellar　behavior.　This　method　is　useful　for　the　investigation　of　surfactant　systems　in　which　strong　intermolecular　interactions　occur.　©　Editorial　office　of　Acta　Physico-Chimica　Sinica.