This research aims to evaluate the regulation and supervision of banks after the establishment of the Financial Service Authority. Objects used in this research is the Representative Office of Bank Indonesia Region of Yogyakarta to study subjects of documents related to the diversion function of regulation and supervision of banks. Respondents in this research were 3 employees of Bank Indonesia Yogyakarta and 1 employee Secretariat Group of Bank Indonesia. Techniques of documentation and data collection using unstructured interviews. The results of this reserach that the function of regulation and supervision of banks after the establishment of the Financial Services Authority will be optimized and the preparation of replace function has already done suitable by target. A document will be used in this diversion have been checked the existence and completenes and there is a clear about a split of authorit between Bank Indonesia function and Financial Services Authority function.