To address the limitations of traditional zwitterionic surfactants in terms of insufficient interfacial activity and tolerance under harsh conditions，a novel amide sulfonate zwitterionic surfactant （LECN） was synthesized via a two-step reaction using lauric acid （LA），N，N -dimethylethylenediamine （DMEDA），and sodium 3 -chloro- 2 -hydroxypropanesulfonate （CHPS-Na） as raw materials. The optimal molar ratio of LA，DMEDA，CHPS-Na was determined to be 1 ∶ 1 . 1 ∶ 1 . 1 . The comprehensive performance of LECN，including surface/interfacial activity，foam properties，emulsifying stability，and temperature and salt resistance，was systematically evaluated. The results showed that LECN exhibited a critical micelle concentration of 0 . 05 g/L，with a corresponding surface tension of 28 . 2 mN/m. At the mass concentration of 0 . 1 g/L，LECN could reduce the interfacial tension between cyclohexane and water to 0 . 045 mN/m. At 25 ℃，the 0 . 05 g/L LECN system achieved a foam volume of 670 mL and a half-life of 1900 s. The 0 . 05 g/L LECN system showed good emulsifying stability with a water separation rate of only 35 . 5 % after 70 minutes. Moreover，under 120 ℃ and a salinity of 120 g/L，the variation in surface tension was ≤ 4 . 7 mN/m，demonstrating excellent temperature and salt resistance. All these properties were significantly superior to those of the reference samples CAB，SDS，and Triton X- 100 . The synthesis of LECN features readily available raw materials，mild reaction conditions，and simple operation，showing great potential for industrial application. This work provides a new strategy for the development of high-performance zwitterionic surfactants and is expected to promote their application in petroleum extraction，daily chemicals and other fields.