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The history of the study to apply the ion current to gasoline engine control is so long, and many papers on modeling and application have been published so far. Especially, the study on modeling has been advanced, and it has become possible to estimate the ion current. And in the area of application, many papers have proposed the detection method of engine knock, pre-ignition, combustion stability and so on. However, there few results the proposed methods were put to the production engine. This paper proposes the internal exhaust gas recirculation (EGR) control system based on ion current which enables to set the limit value of internal EGR rate, so as to extract the best fuel efficiency of engine itself.