Abstract: A new unsymmetrical Bolaform surfactant, namely disodium sulfodehydroabietate (DSDA) was synthesized by sulfonation of dehydroabietic acid followed by neutralization, and its structure was characterized by FT-IR, 1H NMR and MS. The critical micelle concentration (CMC) of DSDA was determined by surface tension method at 303.0K, pH value 10.5. The surfactivity at different NaCl concentrations (0-0.50mol/L) was studied. The results showed that DSDA shows a transition in its surface tension curve; the CMC of DSDA solution decreases from 25mmol/L to 3.83mmol/L along with the increase of NaCl concentration, the surface ultimate adsorption at the air/water interface (Г∞) decreased and the minimum surface tension was basically unaffected.