“九一八”事变后,“安内攘外”作为蒋介石处理内外关系的一项重要政策,历来被学者们所关注研究。学者们从不同的角度对此政策的不同层面,做了大量卓有成效的探讨,但对该政策的成因探讨不多。文章在前人研究的基础上,从历史学和心理学的角度,探讨了该政策形成的原因。 After the “September 18” Incident, “Anti-aggression and Aggression” as an important Chiang Kai-shek policy to deal with the internal and external relations has always been the concern of scholars. Scholars made a lot of fruitful discussions on different aspects of this policy from different perspectives, but they did not discuss much about the causes of this policy. Based on the previous studies, the article explores the reasons for the formation of the policy from the perspective of history and psychology.