In 2017-2018，compared with the uncertainty of the Brexit and the complex variability of the international situation，the Sino-British cooperation developed relatively steadily in the “Golden Era”. Bilateral relations have been advancing in a pragmatic manner，and the exchanges in political，economic，cultural and scientific areas have improved on the whole，while substantial progress has been made in terms of cooperation on major projects under the “Belt and Road Initiative” framework. At the same period，the Brexit negotiations between the UK and the EU entered a “critical stage”，with the British government’s internal and external policies being adjusted accordingly，which has a certain impact on the outside world. In addition，on some issues such as “China and the rules-based international system”，“national security and infrastructure investment review” and “free navigation” in South China Sea，different voices in the UK exist，which have influenced May’s government’s China policy to some extent. In the near future，if Britain and the EU can reach a consensus，and Britain could “orderly” exit from the EU，as permanent members of the UN Security Council and two of the world’s major economies，China and Britain are expected to jointly build some kind of “Rules-based Partner”，to jointly uphold the international order and systems based on the purposes and principles of the UN Charter，and the multilateral trading system with the World Trade Organization（WTO）at its core. The upgrading of trade relations in the post-Brexit era will also be one of the priorities of the future development of Sino-British bilateral relations.