本文从历史学和心理学的角度探讨了西安事变期间蒋介石政策转变的原因 ,指出一定的民族主义意识、华北事变以后中日民族矛盾的尖锐、蒋介石的求生本能和宋美龄等人的亲情感化是促成蒋介石政策转变的主要因素 ,同时分析了这些因素在促成这一转变过程中各自所起的作用。 This article explores the reasons for Chiang Kai-shek’s policy change during the Xi’an Incident from the perspective of history and psychology. He points out that there is a certain sense of nationalism, the sharp contradictions between China and Japan after the North China Incident, the intrinsic instinct of Chiang Kai-shek for his life, and the affection of his family members Chiang Kai-shek policy changes in the main factors, at the same time analyzed these factors in contributing to the transformation process their respective roles.