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Although there have been a lot of reasons one of the most important motives for bank mergers is optimal size. But the subject of optimum size in banking sector has been discussed for a long time. This state is not clear from the point of view of Turkish banking sector. In some studies the performances of big banks have been acceptable but in others can?t acceptable. Certainly examining the relations between bank mergers and optimum size is important for their influences on a country?s economy and future of banking sector. For this reason we studied an empirical investigation that investigates the performances of assets size whose banks in Turkish banking sector. In this study we have investigated four-years-performances of big banks small banks and medium size banks. So we wanted to see the influences of size performances which has been arised by bank mergers.