<p>This paper focuses on the research of binary composite flooding systems, comprehensively analyzing their chemical properties and enhanced oil recovery (EOR) performance. The binary composite flooding systems, usually composed of two main components, such as a surfactant and a polymer, can synergistically improve the displacement efficiency of oil reservoirs. Through laboratory experiments and field application data analysis, the chemical characteristics including interfacial tension reduction ability, viscosity-building performance, and long-term stability of binary composite flooding systems are studied. Meanwhile, the EOR mechanisms and influencing factors are explored in detail. The results show that binary composite flooding systems can effectively reduce the interfacial tension between the displacement fluid and crude oil, increase the viscosity of the displacing fluid, and improve the sweep efficiency and displacement efficiency of oil reservoirs, thus achieving significant EOR effects. This research provides a theoretical and practical basis for the further application and optimization of binary composite flooding technology in the oil industry.</p>