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CO2 Injection is one of Enhanced Oil Recovery methods that developed to contribute to decrease global warming issues and to improve oil recovery. The aim of this research is to determine the influence of increasing CO2 volume injection on reservoir characteristic fluid. This research was conducted by laboratory experiment. Samples used to analyse were come from Beta field in Tuban Formation. This research was conducted into three steps, there were determination of Minimum Miscible Pressure of CO2, determination of PVT fluid composition, and determination of CO2 injection to fluid characteristic that include viscosity and swelling oil. From the experimental, yield the minimum miscible pressure of CO2 injection for Beta field is 2800 Psig. By increasing 10% volume CO2 injection, oil recovery was increased due to increase CO2 solubility. The swelling effect due to dissolved CO2 also led to changes in viscosity for Beta field is 0.588 to 0.541 cp. In addition, percentage of CO2 composition increase 30% from the original since CO2 injection due to solubility CO2 into hydrocarbon fluid. This research can be concluded that by increasing of volume CO2 injection into miscible displacement can affect in changes of fluid characteristic reservoir and improve oil recovery.