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Contiuous increasing of fuel need in Indonesia, at least in the last ten years, is the reason for improving domestically crude oil production. Exploitation in the form of oil drainage activities needs to be investigated further. Surfactants as an agents that believed can reduce interfacial tension, need to be determined the formulation and compatibility in their use for oil drainage from reservoirs. Screening of the conditions of surfactant operation needs to be done in order to provide optimal oil recovery. In this study a surfactant behavior test was carried out on AOS (Alpha Olephin Sulfonate) in a laboratory scale, using sandpack as a sandstone reservoir rock prototype, measured the effect of salinity and concentration on oil recovery in chemical flooding. From the measurements, it was found that a surfactant concentration of 1.5% worked optimally in formation water with a salinity of 10,000 ppm, and produced a recovery factor of 7.5%. The emulsion formed shows that the surfactant works in the upper phase, or tends to dissolve in oil, correlates with the basic ingredients of surfactant which is an oil base.