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Indonesian oil and gas needs continue to increase, all of which are inversely proportional to oil and gas production which is always decreasing, one of the efforts to increase production is by EOR injection, one of the EOR injections is polymer injection. In this study we will use FP3300S polymer with a concentration of 500ppm, 750ppm, 1,000ppm, 1,250ppm, 1,500ppm, 1,750ppm, 2,000ppm, 2,250ppm and 2,500ppm. The purpose and objective of this study was to determine the effect of polymer concentration on increased viscosity, determine effect of polymer concentration on polymer screening (compatibility, filtration, screen factor, thermal stability), and to find out how the results of polymer injection, the higher the study found. polymer concentration the higher the viscosity where the highest at the polymer concentration of 2,500ppm with 19,38cp, the viscosity needed by the polymer as the injection fluid is the polymer viscosity greater than 2X the oil viscosity to be injected, where the oil viscosity is 5,2cp. then while in polymer screening it is found that the higher polymer concentration is not necessarily good for screening polymers, and polymer inclusions have been shown to increase recovery factor, recovery factor obtained at 51.5% water injection and polymer injection is 23.1%, before injection really need to be on do screening first, in order to get the most optimal concentration to be injected.