Japan's China policy basically follows the sovereignty principle of international law, and takes the strategy of ambiguity in the issue of China Representation before 1989. Based on the ”One China sovereignty, Two Government Entities” principle, and focusing on the ”UN-centric” and ”separating economy from Politics” policy, Japan expands national interest in cold war period. In Post-Cold War era, Japan changes the Originate Policy of Mainland China favoring through expanding Japan-American alliance, boosts relation between Taiwan, and promote the peaceful resolution of issues cross Taiwan Strait.