The 2024 US presidential election has attracted widespread attention from all over the world. The two parties have obvious differences in international policies，so the election results will have a major and far-reaching impact on the US and the global order. Since Harris replaced Biden as the Democratic candidate，the gap between her and Trump in the polls has been very small，especially in the swing states where the election situation is stalemate，which has further increased the uncertainty of US foreign policy. From the perspective of the Democratic Party，the Biden administration’s governance capabilities and foreign-related policies have been constantly questioned，and Harris’s personal political reputation is not as good as Biden’s，which has affected the Democratic Party’s election situation. From the perspective of the Republican Party，factors such as the serious split between populists and the establishment and Trump’s involvement in judicial charges have interfered with the Republican election situation. In the end，if Harris comes to power，it is highly likely that the Biden administration’s policies will continue，and the alliances will continue to strengthen. If Trump is re-elected，he will return to the unilateral “America First” domestic and foreign policies. But no matter who is elected，the trend of multi-polarization will not change，the trend of continuous change in the international order in turmoil will continue，and the China-US relations will enter a new stage.