网格认证是网格安全的重要组成部分，是对网格实体身份有效性进行确定的过程。网格环境下虚拟组织为认证提出了新的要求。介绍了网格环境下虚拟组织的特点，阐述了网格认证的基本要求，分析了几项常用的认证技术不适合多结点网格认证的原因，在此基础上分析了Globus 项目中基于GSI 认证的相关技术及概念。网格技术是一项不断发展的技术，网格认证也处于不断完善之中。关键词：虚拟组织；GSI；相互认证；代理；授权;Abstract: Grid authentication is an important component of Grid Security, and is the confirmation process of grid entity's identity validity. The virtual organization has put forward the new demand for authentication under the grid environment. Introducing the characteristic of virtual organization which under the grid environment, illustrating the basic demand of grid authentication, analyzing reasons of several commonly used authentication technology which does not suit to multi-sites grid authentication, analyzing the relevant technologies and concepts based on GSI authentication of Globus project. Grid technology is a developingtechnology; grid authentication is in perfecting constantly too.Key words：virtual organization; GSI; mutual authentication; proxies; delegation；