Abstract: Facing the international relations and nuclear security situation in the new era,the complexity of nuclear deterrence is manifested in the definitions of motivation,responsibility and the judgment of good and evil.Nuclear deterrence itself possesses reasonable value of low cost and good effect,providing security guarantees for maintaining world peace and building a human community with shared destiny.However,nuclear deterrence is essentially an intentionality to use huge material force,which may suppress free will and cause technical,political,and moral risks.In considering the value of nuclear deterrence,we should clarify its source,content and standpoint.It is a nuclear power's international obligation to dialectically recognize the rationality and risk of nuclear deterrence,uphold the value standpoint of a human community with shared destiny,and play a positive value of nuclear deterrence so as to avoid negative consequences.

Key words: nuclear deterrence, complexity, rationality, risk, value