由于网格环境中存在着大量分布、异构、动态的资源和服务,快速、准确地进行资源发现,是关系到网格计算性能的关键因素之一。该文按照虚拟组织(V irtual Organization)——机构(Institution)——资源(Resource)的层次,建立分层网格模型,提出了该模型上的资源发现机制,包括信息共享、消息扩散及资源查询机制。通过模拟实验,表明了该资源发现机制的查询应答率较高,同时消息扩散的开销较小。 Due to the large number of distributed, heterogeneous and dynamic resources and services in grid environment, the rapid and accurate resource discovery is one of the key factors that affect the performance of grid computing. This paper establishes a hierarchical grid model according to the level of the Virtual Organization - Institution - Resource and proposes the resource discovery mechanism on the model, including information sharing, message diffusion and resources Query mechanism. Simulation results show that the resource discovery mechanism has a high query response rate and a smaller message diffusion cost.