As a tensegrity system,the large annular cable-bar dome has good performances.Up to now,few studies on this type of structure have been carried out at home and abroad. 大型环状索杆结构兼有穹顶网壳结构和索穹顶结构的优点，是一种柔性索系和刚性杆件相结合的性能优越的张力集成自平衡体系。
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。
