本文提出一种基于代理的语义对等网环境下数字图书馆的四层模型,包括资源层、对等层、代理层和应用层,分述了各层的功能,探讨了各代理采用工作流模式实现网络服务的过程。异构数字资源的对等连接能够保证系统搜索的实时性和深度,本体的引入可以增强语义,代理的应用则加强了系统的自主性和适应性。仿真实验表明模型是有效的。 This paper proposes a four-layer model of digital library based on the semantic peer-to-peer network environment, including resource layer, peer layer, agent layer and application layer. The functions of each layer are described. Mode of network services to achieve the process. The peer-to-peer connection of heterogeneous digital resources can guarantee the real-time and depth of system search, the introduction of ontology can enhance the semantics, and the application of agent enhances the autonomy and adaptability of the system. Simulation results show that the model is effective.