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The application of surfactant flooding to increase the oil production has been widely known as an alternate to extract the trapped oil in the mature oilfield. The surfactant-s ability for lowering the interfacial tension (IFT) of oil and water that increase the capillary number is the main mechanism in Enhanced Oil Recovery (EOR) methods to reduce the residual oil saturation. The effect of ultralow IFT of a novel natural oil-based surfactant to the residual oil saturation was investigated, whereas the effect of different flow rate during injection as one of CDC parameter was also assessed. Core flooding experiments were used as the main tools to evaluate the influence of IFT to the capillary number (Nc) that consequently affecting the residual oil saturation (Sor). The results showed that injecting ultralow IFT surfactant were able to increase oil recovery or lowering the residual oil saturation Oil saturated core was continuously injected with and without ultralow surfactant to analyze the effect of IFT to the residual oil saturation, whereas CDC profile was obtained by injecting ultralow IFT at different rate as one of the CDC parameter. The oil produce from the outlet of coreflood was collected and calculated to measure the total recovery of water or surfactant injection. CDC can then be generated by plotting the Nc with the Sor. The results showed that injecting ultralow IFT surfactant were able to increase oil recovery or lowering the residual oil saturation as much as 4%, whereas CDC-s result showed that the residual oil saturation decrease with increasing Nc, with the optimum Nc to produce oil was at the level of 10-7, rate 0.1 to 1.0 cc/min, increased 104 from Nc at waterflood stage.