容差网络可及点的合理选择，是模拟电路故障诊断理论中一个急待研究的课题。它涉及到故障的可诊断性，易觉察性和故障可测度等诸方面问题。本文在文献[1,2]的基础上，应用区间分析法探讨容差网络可及点的优化选择。文中提出一系列优化选择可及点的方法和公式，它对工程实际网络的应用都具有一定指导意义。 Tolerance network can be a reasonable choice of point, is an urgent problem to be studied in analog circuit fault diagnosis theory. It relates to fault diagnosis, detectability and fault measurement and other issues. Based on the literature [1] and [2], this paper discusses the optimization of the accessibility of the tolerance network by using interval analysis method. This paper presents a series of methods and formulas to optimize the selection of points, which is of guiding significance to the practical application of engineering networks.