1931年9月18日,日本策划发动了一场灾难深重的倾略性战争。引起这场战争的原因是多方面的,不仅受到国际因素的影响,而且主要是受交战双方的原因导致。中国方面蒋介石采取的“攘外必先安内”政策又是这场战争得以顺利进展的罪魁祸首。本文就旨在分析蒋介石的“攘外必先安内”与“九一八事变”的关系。 On September 18, 1931, Japan plotted a disastrous and decisive war. The causes of this war are manifold and affected not only by international factors but mainly by the warring parties. On the Chinese side, Chiang Kai-shek has taken the “policy of” settling out foreign relations first and foremost “and is the culprit in the smooth progress of this war. The purpose of this paper is to analyze Chiang Kai-shek’s relationship with the ”September 1 Incident“ and the ”September 18 Incident".