The concept of Wang Ba Thought at the pre-Qin period was under the background of the princes vied for supremacy. Especially, the Mencius and Xunzi Wang Ba Thought provided the great reference and far-reaching influence for the future generations. China and America are respectively the world's largest developing country and developed country, and some great differences exist between them in historical and cultural background, social system and ideology, which lead to the different diplomatic strategies and values. It will be an important approach to summarize the realistic significance in China's diplomatic strategy in the contemporary society by combining the ways of historicism and realism, analysis and research on Mencius and Xunzi Wang Ba Thought, and discussing China's "King Diplomatic Strategy" and America's "Hegemony Diplomatic Strategy".