International financial sanctions have been increasingly used since the World War II. But what about the rationality? For the developing countries, especially China, the second largest economy in the world, how can it maintain its financial security in the context of China's major country diplomacy in the new era and in the transition from a trade power to a financial power? This paper begins with the definition of international financial sanctions by analyzing the characteristics of

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... al financial sanctions. Next, it sorts out its historical evolution process and then discusses the rationality of its existence. It is concluded that the implementation of relevant sanctions should be decided by the U.N. Security Council in the way of resolution. The secondary sanctions are in essence a tool for the U.S. with unique financial advantages to interfere in other countries' internal affairs and lack international legitimacy. Finally, it's suggested that on one hand, China needs to take precautions in financial sanctions imposed by other countries; on the other hand, China should have a correct understanding of financial sanctions and give full play to non-violent means such as financial sanctions so as to maintain its core national interests. Therefore, China should promote the reform of the UN sanctions system and improve its domestic system.