Based on the analysis on the classical ALM systems, protocols and middlewares, this paper summarized the fundamental functions of ALM, and further presented a basic architecture of ALM middleware.

• 在分析研究典型的应用层组播系统、协议和中间件的基础上，总结出了应用层组播的基础功能，并提出了应用层组播中间件的一种基本架构。