对网格安全问题的研究是网格计算中的一个热点问题。通过对网格环境下安全需求和网格基础设施GSI 的分析，介绍了一种新的基于知识库的网格安全体系结构，并对这一安全结构进行了分析。关键词：网格；安全；知识库Abstract: Grid security research is a hotspot in grid computing.Via the analysis of the specialrequirements about security in the grid environment and the characteristics of Grid SecurityInfrastructure(GSI),this paper present a novel Grid security architecture based on knowledgebase,then analyzes this architecture briefly.Key words:Grid; Security; Knowledge Base