Gas channeling during CO₂ flooding often reduces sweep efficiency and oil recovery. It is proven that foam injection was effective in controlling CO₂ breakthrough. A wormlike micellar foam system was developed using anionic surfactant sodium α-olefin sulfonate（AOS），zwitterionic surfactant erucic acid amide propyl betaine（EAB），and foam stabilizer alkylamine（TA），and its viscoelastic behavior was systematically investigated. The experimental results showed that the comprehensive index of the foam system with the formula of 0.25% AOS + 0.25% EAB + 0.1% TA could reach 107 208 mL· min. While the foam performance decreased with rising temperature，the system maintained good stability below the temperature of 70 ℃. Viscoelastic analysis revealed that at 0.5% total surfactant concentration，AOS and EAB molecules intertwined to form abundant wormlike micelles，as a result，the bulk viscosity and viscoelasticity of the system was significantly improved. The high viscoelasticity of the wormlike micelle structure could effectively retard the liquid film drainage and enhance the strength of the foam liquid film，and thereby improve the foam stability.