The polymerizable anionic surfactant of sodium 2-acrylamido-dodecyl sulfonate (SADS) is synthesized by using acrylonitrile and dodecyldecene as main raw materials, and its chemical structure is characterized with FTIR, H1NMR and mass spectrum. Then the critical micelle concentrations at 25 ℃ of SADS is measured by using methods of surface tension, conductivity and steady-state fluorescence measurements. The experiment result shows that its critical micellc concentration (CCMC) is 6.15 mol/L at 25 ℃ and the surface tension γCMC is 32.4 mN/m, which means that SADS has higher surface activity than classical anionic surfactant. Besides the value of surface area per molecule calculated by using Gibbs' equation is 3.1 nm2, indicating the relatively large size of the SADS molecule.