Gemini　surfactant　systems　are　investigated　by　the　surface　tension　measurement.　The　results　reveal　that　the　gemini　surfactants　have　higher　surface　activity　than　the　conventional　surfactants.　The　surface　activity　of　gemini　surfactants　strongly　depends　on　the　structure　of　their　spacer　groups.　The　synergism　is　not　marked　and　is　not　as　good　as　DTAB　when　the　cationic　gemini　surfactant　is　mixed　with　the　conventional　anionic　surfactant.　The　equilibrium　surface　tension　(γ　e)　of　a　surfactant　solution　is　not　achieved　instantaneously.　The　DST　(dynamic　surface　tension)　curves　for　the　above　systems　were　measured　and　some　parameters　obtained:　t　i,　t　m,　γ　m,　t*,　n.　The　results　indicate　that　the　instantaneous　surface　activities　of　the　gemini　surfactants　are　higher　than　those　of　DTAB.