摘要
本文介绍了几种应用在化学上的重要的拓扑指数，讨论了它们的定义及求算，指出了它们在有机化合物结构与性能关系研究中的应用．
In the present work,we have introduced several important topological indexes such as Wiener index,Randic index and Hosoya index which have been used in chemistry,discussed their definitions and calculations,and given some examples of their applications in the reseach of relations between structures and properties of organic compounds.
