on the study of researches on performability, this dissertation integrates the performance why reliability on components'level, and presents approaches for analyzing throughput rates of component and terminal-pair, which are just their effectiveness . they can be used for analyzing nonhierarchical and hierarchical network, and even all entwork considering the called-busying . this is just the analysis of the effectiveness of network 此方法也可嵌入到迭代法用于分析无级网、有级网,在考虑被叫忙时的整个网络的业务性能,从而分析了网络的完成性指标有效度。