中文摘要：

日志在软件系统的开发和运行阶段起着非常重要的作用。根据SaaS（Software as a Service）软件单系统多租赁这种一对多的服务模式提出一个能够与SaaS软件集成的日志架构Log4SaaS（Log For SaaS）。通过对该日志架构进行相应的配置和扩展,能够满足SaaS软件分别针对不同用户记录日志的要求。从总体上描述架构的框架设计,并对该架构所有的关键技术进行了分析和讨论,预见了日志架构未来的发展潜力。

英文摘要：

Log plays a very important role in development and operation stage of the software system.This article,based on the one-to-many service model of single-system,multi-leasing which the SaaS（Software as a Service） software is,presents a log architecture Log4SaaS which can be integrated with the SaaS software.Through appropriate configuration and expansion the requirements of different users＇ record logs can be met by SaaS software respectively.This paper describes the overall architecture frame design.All key technologies of the architecture are analysed and discussed as well.Moreover,the potentials for the future development of log architecture are also anticipated.