The question of whether China’s peaceful development is a threat to international peace and security (China threat theory), or not, continues to dominate the academic discourse. Nonetheless, China’s efforts, both in theory and practice, have ascertained that its development not only is peaceful in its nature, but also, is extended throughout the world in numerous ways. This paper mainly investigates China’s peaceful development from the international law perspective and its interaction with international law. It examines the concept of peace in Chinese ancient philosophy, explores China’s peaceful development and its features and argues that it is harmonious with international law in various areas such as the purposes of the Charter of the United Nations, the Millennium Declaration, international human rights, etc. and can potentially contribute to development of international law through theory and practice.