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The needs of petroleum as energy, have increasing while the oil production has depleting. Due to that needs, the method of Enhanced Oil Recovery (EOR) or in other hands as tertiary recovery (after primary recovery and secondary recovery) is being developed. EOR has many methods; one of the methods is chemical injection that consists of surfactant, alkaline and polymer. In this experiment, the author is using surfactant injection. The using of surfactant is to decrease the interfacial tension between oil and water, with the result is surfactant can displace oil through rock pores. This study will be discussing about the effect of salinity, surfactant types and surfactant concentrations on surfactant injection for carbonate rock. Surfactant types that will be used are Alpha Olefin Sulfonate (AOS) and Tween 20. Each surfactant type has its concentration varieties as 0,1%; 0,25%; 0,5%; 0,75% and 1%. Salinity varieties of brine water are 10.000 ppm; 15.000 ppm; 20.000 ppm and 25.000 ppm. From this study, it will determine that how capable surfactant can displace the oil from rock pores, based on the influence of salinity, surfactant concentrations and surfactant types to recovery factor. The determination of recovery factor will be using these methods; Amott apparatus (imbibition process) and injection using core holder and syringe pump. The expectations from this study is there will be get the best result from many parameters of surfactant and brine water salinity to improve the recovery factor, especially on carbonate rock.