西路军问题是中国现代史上一个重要问题 ,同时西路军的失利也是中国共产党领导的武装斗争过程中很少几次失利中损失最大的一次。本文围绕西路军失败的原因 ,从战略任务角度入手 ,论证战略任务的不断变化是西路军失败的主要原因。 The issue of the road route marching into the West is an important issue in the modern history of China. At the same time, the defeat of the West Route Army is also the largest loss during the few armed defeats led by the Chinese Communist Party. Based on the reasons for the failure of the West Route Army, starting from the perspective of strategic mission, this article argues that the continuous change of strategic tasks is the main reason for the failure of the West Route Army.