With the Brexit coming into effect in January 2020,in-depth analysis and research need to be made on what course the EU would follow,how it would readjust its internal and external policies and what implications this readjustment will exert to the future development of China-EU relations.Brexit Will Profoundly Change EU After Brexit,the EU’s international vision may gradually narrow and its openness will gradually decline.The EU will inevitably undergo significant changes in the post-Brexit era.