实验教学是高等教育教学活动中必不可少的一个重要环节。目前许多学校的实验教学现状不能完全适应教学改革的要求，特别是在远程教育教学过程中，由于空间上的分离与条件的限制，学生不能进行实际的实验操作，鉴于这些原因，开发一个能够适应远程教学模式的实验教学系统是非常必要的。近年来，虚拟技术和网络技术的快速发展，为网络虚拟实验系统的研究与开发提供了坚实的基础。 本文正是针对这项课题展开研究开发工作，首先在分析国内外远程教育网络虚拟实验系统研究现状的基础上，阐述了网络虚拟实验系统的研究意义，并对虚拟实验的相关概念进行了界定。其次，对网络虚拟实验系统的功能、结构以及性能等方面进行了需求分析，从虚拟仪器技术、Web服务器的开发技术、Web数据库技术和Web基本协议等方面对基于Web的网络虚拟实验系统的主要实现技术进行了分析与研究。然后，对远程教育中的网络虚拟实验系统进行了总体设计，包括体系结构以及功能模块的设计，重点针对虚拟实验系统中的六个功能模块进行了详细设计。最后，使用虚拟仪器开发工具Lab VIEW实现了信号分析、信号处理和组合类等实验。此外，还对虚拟实验系统的可靠性和安全性进行了分析，并提出了相应的解决对策。 通过网络测试与发布，验证了本系统的设计方案可行，运行效果良好，初步取得了良好的教学效果，达到了系统设计与实现的预期目标，可用于远程教育中的实验操作和管理。

The experimental teaching is an essential link in teaching activities. However, the current status of experimental teaching can not meet the meet the demands of teaching in many schools. Especially, in Distance Education, students can not conduct the actual experimental operation. So it is necessary to develop a distance learning mode which can adapt to the experimental teaching system. In recent years, the rapid development of virtual technology and network technology laid a solid foundation: for further researching and developing the network virtual experiment system. In this thesis, firstly, based on the analysis of the current situation about distance education network on virtual experiment system in all lands, we explored the meaning of researching virtual experiment system and defined some conception. Secondly, we researched the demand analyses of the function, the structure and performance of virtual experiment system and explained the main techniques of the Web-based virtual experiment system from a few respects, such as the technology of the virtual instrument, the web server development, the web database and the web basic protocol. Thirdly, we designed the virtual experiment system for distance education, including systems architecture and design of each function module. Specifically, the six function modules of the virtual experiment system were designed in detail. Finally, we introduced the use of lab VIEW of virtual instrument software development tools, examples of various types of virtual instrument design，for example, signal analysis, signal processing classes and self-realization process for designing experiments. Furthermore, we analyzed the reliability and security of the virtual experiment system and put forward corresponding countermeasures. Both network testing and publishing proved the design is feasible and runs well. The initially teaching results is better，and the expected goal is also achieved. Meanwhile, the system is suitable for distance education in the experimental operation and management. Keywods : Distance Learning Network Virtual Experiment