云环境建设的目的在于将各业务系统中的资源和服务统一管理，为用户提供统一的资源和服务接口，而云中的资源和服务分散在各业务系统中管理，为了保证云环境中资源和服务的安全性，以及为了方便用户使用云环境下的资源和服务，就需要进行单点登录模型的设计，通过用户的单点验证，避免用户需要多次验证以使用不同业务系统的资源和服务。本文在分析云计算单点登录需求的基础上，进行单点登录模型整体结构和单点登录流程的设计。

Cloud environment construction is to manage the resource and service of different business systems in a unified way,to provide a unified interface for users. To ensure the safety of resources and services in cloud environment, and for the convenience of users to use these resources and services, the design for a single sign-on model is necessary. It can avoid repeated verification. On the basis of the analysis of the demand for cloud computing single sign-on, this paper designs the overall structure and process of the system.