As the blood in the five plan of the Belt and Road Initiatives, financing is indispensable to perfect unity domestic financial system and advanced and effective foreign exchange management system. The regionalization of RMB in central Asia has good economic foundation and the existing rules of international law are also conducive to it. However, China’s law system is not sufticient to make RMB convertible. In order to promote the regionalization of RMB in central Asia, we should optimize the domestic legal system by the following several paths: the unifying of national financial regulatory legislation and regulatory agencies, the supplement of financial transaction rules based on international standards, making arbitration procedure to the first way to solute disputes in financial transactions, and so on.