Discovery System is a new trend of digital resource integration. This paper investigates the application status in libraries of Summon, EDS, Primo, Superstar discovery, Duxiu academic search and eduChina by Internet investigation and practical operation. It introduces the meaning and development of resources discovery system, and compares those discovery systems from the aspects of metadata, retrieval and interface, functional architecture and business factors. In addition, it puts forward several suggestions to improve the functions of systems in China, such as increasing the amount of resources, improving the copyright awareness of metadata, strengthening the openness of system, standardizing the relevance ranking results, as well as assisting the integration of library resources.%发现系统是数字资源整合的新趋势，论文通过网络调查和实际体验Summon、EDS、Primo、超星发现、读秀学术搜索、e读等发现系统在图书馆的应用情况，对发现系统的发展及含义进行介绍，从元数据、检索与界面、功能架构、商务因素4方面对以上6个系统进行对比，进而提出增加资源覆盖量、提高元数据版权意识、加强系统开放性、规范相关性排序结果、辅助整合图书馆资源等完善我国发现系统功能的建议。
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