The definition and genaral identities of GIS software or function are discussed, priciple schemes for GIS functions are researched. On the bases of functional comparing on functions between some knoun GIS softwares, some usefull suggestions are improved.

• 探讨了GIS软件与GIS功能的主要特征；总结了GIS软件(或功能)的基本实现方式；列举了现有的部分知名GIS平台与应用系统的特点与功能；从中可以了解GIS技术的主要发展动向.