The　effect　of　sodium　salicylate　(NaSal)　on　the　formation　and　properties　of　wormlike　micelles　in　aqueous　solutions　of　2-hydroxyl-propanediyl-a,.-bis(dimethyldodecylammonium　bromide)　(12-3(OH)-12)　and　propanediyl-alpha,omega-bis(dimethyldodecylammonium　bromide)　(12-3-12)　at　a　surfactant　concentration　of　50　mmol　.　L-1　was　investigated　using　steady-state　and　frequency　sweep　rheological　measurements.　In　the　absence　of　a　salt,　12-3(OH)-12　or　12-3-12　only　produced　spherical　or　small　rod-like　micelles　at　50　mmol　.　L-1.　The　addition　of　NaSal　promoted　micellar　growth　yielding　wormlike　micelles　in　both　systems.　12-3　(OH)-12　showed　a　more　sensitive　response　to　the　added　NaSal　compared　with　12-3-12　and　formed　wormlike　micelles　at　relatively　lower　salt　concentrations.　Moreover,　the　wormlike　micelles　formed　by　12-3　(OH)-12　were　longer　than　those　formed　by　12-3-12,　resulting　in　higher　viscosity　for　the　former　solution.　These　were　attributed　to　the　hydrogen　bonding　interactions　between　the　hydroxyl　substituted　spacers　in　the　12-3(OH)-12　system,　which　increased　hydration　on　the　aggregate　surface　and　stimulated　the　dissociation　of　counterions.　The　higher　charge　on　the　12-3(OH)-12　micellar　surface　was　strongly　associated　with　Sal-,　which　led　to　a　tighter　packing　of　the　surfactant　molecules　in　the　micelles　and　thus　strengthened　the　intermolecular　hydrogen　bonding　interactions　and　effectively　reinforced　the　growth　of　the　12-　3(OH)-12　micelles.