Since the economic crisis 1997 the implementation of good corporate governance being an issue in Indonesia. The bad thing of governance\u27s company in those days causing Indonesian economy being slump. So, every one agree to recovered from adversity, Indonesia have to start with governance good corporate. The main objective of this research was to determine the effect of implementation of good corporate governance (GCG) to return on equity. The purpose of this research is to know about the influence of empirical evidence of Good Corporate Governance practices to the company\u27s financial performance. The independent variable in this research is the implementation of GCG and the dependent variable is the financial performance using a ratio of profitability. The sample in this study were banking sector companies listed in Indonesian Stock Exchange (IDX) in the periode 2009-2013. The number of sample used were 16 companies listed were taken by purposive sampling. The method of analysis of this research used simple regression with SPSS 20 Program