This study has the purpose of understanding and explaining Chinese diplomatic policy by studying how the history-of-civilization factor has influenced China, especially Hu Jintao leadership’s diplomatic policy through studying Guanzi in the Spring and Autumn Period and the Warring States Period through the speech of Hu Jintao, the former General Secretary of the communist party of China. As the terms of ‘The return of Asia’ and ‘Group of Two’ indicate, the role and the position of China in the international community have changed. If so, what is a fundamental agent for the Chinese foreign policy change? Is it possible to understand the agent only with analysis of foreign environmental factors and domestic political factors like the study of existing researchers? Unlike the existing research, this study investigates and reveals what the cultural and civilizational headwaters are, which have an effect on the foreign strategy or policy of domestic and foreign policy makers of the People``s Republic of China. This study pays attention to ‘Guanzi’ who is being misunderstood in Korea. Guanzi is not a philosopher of Legalism but a smelting furnace of Chinese philosophy where Confucianism, Taoism, Legalism melted together. This research focuses on finding the ideological origin of ‘Harmonious World,’ the foreign policy core concept of Hu Jintao leadership in the philosophy of Guanzi. It is to find the harmony of politics and economics, human and nature, the rule of manners and the rule of law, domestic development and foreign development in the philosophy of Guanzi where Confucianism, Legalism, and Taoism melted all together and to investigate how this harmonic idea is reflected in Chinese foreign policy.