Renminbi was strong in 2017 mainly due to the relative changes caused by the US dollar. The main reason for the decline in the dollar was the relative devaluation of the Euro and the Yen, as well as the global reallocation of capital in such a situation, leading to the devaluation of the dollar. However, at present, the U.S. economy still runs fairly well. Trump's tax reform is again guiding the U.S. economy to a deeper reform so as to consolidate the foundation of economic growth. Many aspects of the U.S. economic reform are ahead if those of Europe and Japan, and the U.S. dollar’s future will continue to be optimistic.