SMP――对称多处理的体系结构带来了很多单处理器体系中所没有碰到的问题，linux的新版本已经加入对SMP系统的支持，本文讨论了SMP系统所带来的各种问题，并且通过分析源码讲述了linux下SMP的实现。-SMP -- symmetric multi-processing architecture has brought a lot of single processor system does not encounter problems, The new version of linux have joined to support SMP system, This paper discusses the SMP system and the various issues, and through the analysis of the source code on linux under SMP realized.