Firstly ,the paper has presented the development of help system of NNC and emphasized the key technologies, such as editing file filter, importing documents of help, making web pages ect. Then, the simulation system has been analyzed and designed.

• 首先介绍网络数控系统的帮助系统的开发,并着重分析帮助系统的界面设计、编辑文件过滤器、调入帮助文件、制作网页等关键技术问题。