China’s foreign trade expansion shows new motivation in international trade endowed by transitional economy. Explanation for the motivation tests the hypothesis that import and export in transitional economies is required to expand at abnormal speed while current theoretical descriptions for dynamics complex for international trade are required to be refreshed to meet equilibrium conditions in both short and long term in transitional economies. And findings in this paper show that outward trade diversion has been subject to dually identification from both sector and area dimensions in China's opening episode.