The　rheological　behavior　of　carboxylate　gemini　surfactant　O,O＇-bis(sodium　2-tetradecylcarboxylate)-p-dibenzenediol　(referred　to　as　C14φ2C14)　with　a　concentration　of　140　mmol·　L1　in　aqueous　solution　in　the　presence　of　100　mmo·　L1　NaBr　was　investigated　by　frequency　sweep　and　steady　rate　sweep　measurements.　The　solution　showed　the　characteristics　of　a　Maxwell　fluid　with　a　single　stress　relaxation　time　at　low　shear　frequencies.　Analysis　by　the　living　polymer　model　indicated　that　C14φ2C14　formed　long　(3.66.8　μm)　wormlike　micelles　at　25　°C,　which　were　observed　by　cryo-transmission　electron　microscopy　(cryo-TEM).　The　micelles　were　entangled　with　each　other,　resulting　in　a　very　viscous　solution　(the　zero-shear　viscosity　was　as　high　as　1.10×104　Pa·　s)　that　looked　like　a　gel.　On　raising　the　temperature　to　70　°C,　the　relative　viscosity　was　still　as　high　as　1.8×104,　which　is　very　rare　for　anionic　wormlike　micelle　systems.　The　flow　activation　energy　(Ea)　was　estimated　to　be　(141±5)　kJ·　mol1.　The　size　distribution　of　C14φ2C14　was　determined　by　dynamic　light　scattering.　Large　aggregates　with　a　size　of　~100　nm　were　observed　at　low　concentrations　of　510　mmol·　L1.　These　large　aggregates　readily　transformed　into　rodlike　and　then　wormlike　micelles　as　the　surfactant　concentration　increased.　©　Editorial　office　of　Acta　Physico-Chimica　Sinica.