In order to reveal the emulsification and demulsification of the alkali-surfactant-polymer（Na₂CO₃/KPS/HPAM， ASP） flooding in Xinjiang oilfield， the emulsification and demulsification of the ASP flooding prepared in laboratory were studied. The results showed that the Na₂CO₃had the most significant effect on the interfacial tension（IFT）between the simulated emulsion and the crude oil. When the Na₂CO₃， KPS and HPAM contents increased from 0 mg/L to 400 mg/L， the IFT decreased from 13.957 mN/m to 0.018 mN/m. The KPS had a remarkable effect on the decrease of Zeta potential， and the Zeta potential decreased from -31.5 mV to -53.6 mV when the amount of KPS increased from 0 mg/L to 600 mg/L. The HPAM had the most significant effect on the viscosity of the simulated emulsion， while Na₂CO₃ and KPS didn’ t show the function. The lower IFT， the stronger electronegativity， the higher emulsification and the higher viscosity of the water phase jointly resulted in a highly stable emulsion. In the process of demulsification， the IFT and Zeta potential of the emulsion increased sharply， moreover， the changes of the IFT and Zeta potential were positively correlated with the effect of demulsification. AR type demulsifier could produced the best of demulsification effect in treating the ASP flooding from Xinjiang oilfield