The dynamics of relations between China and the United States have undergone a significant transformation following the G20 Summit, which was held in Indonesia. These changes reflect the various strategic interests and global challenges facing both countries. As the two largest economies in the world, their interaction greatly influences global stability. At the G20 Summit, the two countries faced contemporary issues such as climate change, international trade and cyber security. China uses this forum to promote sustainability initiatives and demonstrate its commitment to the Paris agreement. Meanwhile, the United States emphasizes the importance of transparency and responsibility in environmental issues. One of the main outcomes of the summit was a joint statement declaring the need for collaboration in various fields. This provides a positive signal even though political and economic tensions remain. However, many parties are skeptical about the implementation of the agreed measures, given a history of previous disagreements on key issues. After the summit, trade issues came into greater focus. The United States demands that China reduce its trade deficit and comply with international trade regulations. On the other hand, China is trying to diversify its export markets and reduce dependence on America. This creates ongoing tension, where each party issues policies that can affect global markets. Apart from trade, military relations were also a major concern. China is increasing its military presence in the South China Sea, while the United States is strengthening alliances with countries in the region, such as Japan and Australia. This adds complexity to bilateral relations and increases the risk of conflict. Human rights issues in Xinjiang and Hong Kong are also issues that influence these dynamics. The United States often criticizes China’s policies, which makes diplomatic relations increasingly tense. China, in turn, insists that this is interference in internal affairs. Starting from economic issues to security, the dynamics of relations between China and the United States are greatly influenced by their respective national interests. While meetings at the G20 Summit provide hope for constructive dialogue, the challenges that exist require wiser policies from both sides. Further developments will depend largely on how individual countries respond to these challenges in an increasingly complex global context.