In recent years, Northeast Asian security has encountered numerous intractable problems, and the lack of substantive Sino-U.S. cooperation makes them difficult to resolve. A Sino-U.S. dual leadership system will be ideal for both countries to cooperate on regional security issues. On the one hand, power distribution in Northeast Asia and the relative power balance between China and the U.S. suggest that a relatively balanced dual structure has emerged in the region. On the other hand, the dual leadership system will further the interests of both countries as well as those of the rest of the region. Our theoretical analysis and case studies show that China and the U.S. could try to build dual leadership at bilateral, trilateral, and multilateral levels.