The　effects　of　different　salts　on　the　self-assembly　of　the　carboxylate　Gemini　surfactant　O,O＇-bis　(sodium　2-dodecylcarboxylate)-p-dibenzenediol　(referred　to　as　C12φ2C12)　were　studied　using　dynamic　light　scattering　measurements.　The　results　showed　that　the　addition　of　salts　induced　the　transition　of　the　networklike　aggregates　into　two　new　aggregates　with　small　(hydrodynamic　radii　Rh,app　of　several　nanometers)　and　large　(Rh,app>100　nm)　sizes,　which　coexisted　in　solution.　A　solubilization　test　using　a　1,6-diphenyl-1,3,5-hexatriene　(DPH)　probe　confirmed　that　the　small　aggregates　were　spherical　micelles　with　a　core-shell　structure.　Rheological　measurements　suggested　that　the　large　aggregates　were　threadlike　micelles.　The　aggregate　transition　was　attributed　to　the　instability　of　the　initially　formed　network-like　aggregates.　The　added　counter-ions　associated　with　the　head-groups　of　C12φ2C12,　which　destroyed　the　hydrophile-lipophile　balance　and　resulted　in　the　aggregate　transition.　The　salt　effect　followed　the　order:　MgCl2>NaCl,　Bu4NBr>Me4NBr>Et4NBr>Pr4NBr,　where　Bu4NBr　is　special　and　not　in　the　order　of　electrostatic　attraction　since　it　provides　an　additional　force　through　the　hydrophobic　interaction　of　its　butyls　with　the　alkyl　tails　of　C12φ2C12.　©　Editorial　office　of　Acta　Physico-Chimica　Sinica.