本文通过直达路由的建立,模拟等级制网路内部结构的演变过程,在满足话务量增长的条件下,以经济合理为目标,针对我国一级长话干线网结构,进行了计算机优化计算。对结果的分析表明,我国一级长话干线网经济合理的演变应是随着话务量的增大而逐步趋向于网状,2000年点点相连程度达到80%,发展重点在中路和东南路,发展的关键时间为今后十到十五年。 In this paper, through the establishment of direct route, we simulate the evolvement of the internal structure of the hierarchical network. Under the condition of satisfying the growth of the traffic volume and the goal of economic rationality, we optimize the computer for the first-grade long-distance trunk network in our country. The analysis of the results shows that the economical and reasonable evolution of China’s first-tier long-distance trunk network should gradually become more and more reticular with the increase of traffic volume. The degree of interconnection reached 80% by a little bit in 2000, and the development focuses on Middle Road and Southeast Road , The key time for development is 10 to 15 years from now.