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. 大型環狀索桿結構兼有穹頂網殼結構和索穹頂結構的優點，是一種柔性索系和剛性桿件相結合的性能優越的張力集成自平衡體系。
The article gives a strictly methematic method of how to fix the number of com-ponent of the multi-phase equilibrium system. 用嚴密的數學方法建立了一種如何確定多相平衡體系中獨立組分數的方法。
