The United States remains a super-tech powerhouse，but its international competitive advantage has been fading. While The Trump administration once again ignored science and slashed federal R&D budget for science，climate change research and clean energy applied research and development，the Congress，which has the final say on the issue，once again boosted federal R&D appropriations to protect science，driven by the serious concern about the United States’ leadership in this arena. At the same time，the U.S.federal government has revived a little bit its macro coordination function on science and technology issues，focused on developing new technologies in areas such as artificial intelligence，quantum，5G telecommunication and advanced manufacturing，with great attention to science and technology for national security and security issues in the field of science and technology. Moreover，Trump’s “America First” and the new national security strategy have made the U.S.government pay more attention to the protection of the key emerging technologies and intellectual property rights that are vital to develop future industries and to maintain national security，but this approach has also led to the closure and conservatism of policy measures related to science and technology innovation，in terms of talent，technology，investment and market access.