The degree of internationalization of a country's currency is mainly reflected in its international influence and the degree of reaction to the international currency exchange rate fluctuations. RMB included in the SDR basket will change the status and role of the RMB in the international monetary and financial system, thus affecting the degree of internationalization of the RMB. This paper constructs the VAR model, and empirically tests the influence of the expected factor of RMB adding in SDR on the degree of internationalization based on the sample interval data from August 11, 2015 to March 16, 2016. The results showed that RMB adding in SDR can enhance the RMB influence on the international monetary and financial system, especially against the dollar. But the RMB influence on other major currencies in the world is still insufficient.During the sample period, the degree of liberalization of the RMB did not increase. For example, the RMB exchange rate does not change with the fluctuation of the world's major currency exchange rates. To give full play to the expected signal function of the RMB to join the SDR, China should actively promote the reform of SDR, while promoting the reform of the financial markets to make the RMB exchange rate move towards a more liberal direction.