Abstract:To investigate the influence of different surfactants, alcohols, salts and their contents and the mass ratio of alcohols to surfactants on the isotropic microemulsion zone of the (AEO-9/SAS60)/petroleum ether/Alcohol/water system, pseudo ternary phase diagrams of (AEO-9/SAS60)/petroleum ether/Alcohol/water systems under different conditions were constructed. AEO-9 and SAS60 were used in surfactants. Alcohols used were C2H5OH, n-C4H9OH, n-C5H11OH, n-C8H17OH. Phase diagrams showed that the synergism was the best when the mass ratio of AEO-9 to SAS60 was 7:3. The single-phase region of the n-pentanol-containing system was the largest among the systems studied. The amount of the solubilizing petroleum ether was maximum when the mass ratio of n-butyl alcohol to surfactants was 0.8;Surface tension reached 24.49mN/m when the concentration of microemulsion was 1.824g/L. The oil-water interfacial tension can reached 9.25?0-4mN/m, when the concentration of microemulsion was 0.3%.