This article studies the current US-China relationship using the dialectic ideas of "I Ching." Firstly, the researcher introduces some basic theories of the topic. The dialectics of "I Ching" is based on the philosophy of Yin and Yang, on which the "unity of opposites" thought is built. The state of a "unity of opposites" relationship can be either equilibrium or disequilibrium. Secondly, the researcher analyses the status quo and trend of the US-China relationship, which is a pair of "unity of opposites," consulting Hexagram Kui ([characters omitted], kuigua), Hexagram Ge ([characters omitted], gegua), and Hexagram Tong Ren ([characters omitted], tongrengua) in "I Ching." Hexagram Kui explains the emergence, development, and intensification of the US-China contradictions, and finds out the crux of the problem between the two. Hexagram Ge analyzes and explains that the US-China relationship is on course for harmony and peace but requires a "revolution." The "revolution" transforms the old ways China and the United States get along with each other, rather than aims to decouple or isolate either of the two countries. Instead, China and the United States should interweave to a larger extent. Hexagram Tong Ren advises putting the US-China relationship in the global context, under the principles of "harmony in diversity" and "seeking common ground whilst reserving differences." It demands realistic approaches to the US-China contradictions, which will result in not only a new model of the US-China relationship but also global unity that can achieve peace and development in the world. This research is optimistic about the future of the US-China relationship. According to the dialectics of "I Ching," the imbalanced "unity of opposites" will always move to balance. And the current imbalance between China and the United States can reveal and unravel the US-China contradictions. The US-China relationship will move from conflicts to harmony.