Chapter six analyzes phase equilibrium and phase rule of the polycomponent system using the principle of equilibrium stability. 第六章利用平衡稳定性原理分析了多组分系统的相平衡，相律。
The article gives a strictly methematic method of how to fix the number of com-ponent of the multi-phase equilibrium system. 用严密的数学方法建立了一种如何确定多相平衡体系中独立组分数的方法。
