This paper studies the traditional international trade theory which developed preliminarily since the fifteenth century and analyzes strengths and weaknesses of various theories. With the time development, and the progress of science and technology, driven by explosive growth in productivity, these theories no longer fit in with newer international trade. Then it led to the current mainstream theories of international trade and the various characteristics of current international trade, including multinational corporations, the international monopoly, the emergence of trade protectionism, and the implementation of various trade policies in different countries. Thus, this paper tries to discuss the endogenous problems of trade protectionism and trade opening policy. This paper thinks that regional economic development should pay attention to the guiding role of policy in the opening, so as to avoid the adverse effects of opening and achieve the purpose of sustainable and healthy development.
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