As an important part of Xi Jinping’ thought on socialism with Chinese characteristics for a new era, Xi Jinping’ thought on diplomacy guides the vivid practice of major country diplomacy with Chinese characteristics from 18th CPC National Congress scientifically. The historical logic of Xi Jinping’ thought on diplomacy’s development and perfection is worthy of further studying and summarizing. In the dimension of Chinese nation’s history, Xi Jinping’ thought on diplomacy acquires Chinese cultural wisdom and achievements of civilization and shows clearly the theoretical power to promote the great rejuvenation of the Chinese nation. In the dimension of People’s Republic of China’s history, Xi Jinping’ thought on diplomacy creates an enabling external environment for Chinese affairs and promotes the whole world toward a fair and reasonable new international political and economic order direction by Chinese development in the progress of the new era from a big socialist country to a powerful socialist country. In the dimension of international socialism’s history and human society’s history, Xi Jinping’ thought on diplomacy displays fully the pioneering significance of Marxism science of international relations and the worldwide value of lofty peace and development cause for humanity.