本文从四个方面 ,对护国运动首先发难于云南的原因进行探析 :1、有利的地理环境和保存相对完整的反袁力量 ,是云南护国首义的客观原因 ;2、广泛的群众革命基础 ,是云南护国首义不可或缺的重要原因 ;3、雄厚的军事力量 ,是云南护国首义的最基本条件 ;4、孙中山先生的指导和云南反袁力量的积极筹备讨袁 ,是云南护国首义成功的保证。 This article analyzes the reasons why the Hu protectionist movement was first attacked in Yunnan from four aspects: 1. The favorable geographical environment and the preservation of the relative integrity of anti-Yuan forces are the objective reasons for Yunnan’s protection of the country; 2. The extensive mass revolutionary foundation Is an indispensable reason for the safeguarding of the country in Yunnan. 3. The abundant military power is the most basic condition for protecting the country and the country. 4. The guidance of Dr. Sun Yat-sen and the active preparations for the anti- The guarantee of the success of the country.