A comparative research on the reducing oil-water interfacial tension，temperature tolerance and salt-resisting properties emulsification property，adsorption of the surfactant on oil sand surface，scaling tendency of formation water，the enhanced oil recovery，performance of oil displacement characteristic of alkali/surfactant（AS）binary combination flooding systems，containing organic bases and inorganic bases，respectively，was conducted. The results showed that，compared with binary combination flooding system of single alkali，the flooding system of compound alkalis could improve the performance of salt-resisting property， emulsification property and oil recovery；the type of base affected the temperature tolerance and salt-resisting properties and emulsification property of the system. The system containing organic bases had better salt-resisting property，being up to 50000 mg/L，and the system containing inorganic bases had better temperature-resisting property，being up to 90℃，and better emulsification property，having the lowest crude oil dehydration rate of 8.5%. The addition of bases could decrease the adsorption of mahogany sulfonate on oil sand surface by 25%～30%. The system containing compound organic bases and compound inorganic bases could both greatly enhance oil recovery more than 18%，however，compared with the system containing compound inorganic bases，the system containing compound organic bases could effectively reduce scaling tendency of formation water. The system containing compound organic bases and compound inorganic bases had different microcosmic oil displacement characteristics.