The　critical　micelle　concentration　(cmc)　and　the　concentration　reducing　20　mN.m(-1)　of　water　surface　tension　(pC(20))　by　the　Gemini　surfactant　series　(m-6-m)　and　the　corresponding　monomers　(C(m)TABr)　were　determined　using　surface　tension　measurements.　Comparison　between　the　active　parameters　indicates　that　the　Gemini　surfactants　have　a　stronger　micellization　and　adsorption　ability　than　C(m)TABr,　which　is　attributed　to　the　hydrophobic　synergism　between　the　alkyl　tails　of　the　Gemini　surfactants.　The　effects　of　dissymmetry　in　the　Gemini　surfactants　(12-6-m)　on　the　micellization　and　adsorption　were　also　discussed.　The　results　showed　that　the　Gemini　surfactant　with　a　symmetric　structure　is　more　effective　in　association　and　adsorption　than　that　with　a　dissymmetric　structure.