For many years, both the scope and methodology of China's diplomatic history have remained stable. Enlightened by theories of international relations and methodology used in studying both European and American diplomatic history, the author wishes to propose a new analytical framework for China's diplomatic history. The first dimension of this framework concentrates on the change of macro-historical stage of development. Generally speaking, China was forced into a new era of diplomacy after 1840 because the industrialized western powers encroached upon her. The second dimension focuses on the impact of international system. For example, the bipolar world system after the Second World War and the multi-polar system in late Ching dynasty exercised different impact upon China's foreign behavior. The third dimension deals with China's national power. We are interested in finding out how changes in China's national power may affect her diplomacy. The fourth dimension has to do with the elites' cognition. For example, we believe that elites' worldeview and self-identification have a great impact on their external behavior. The fifth dimension focuses on the national grand strategy and the derivative policies. Decision-makers' personal traits make the last dimension.