针对实时操作系统μC/OS-II 没有自己的网络协议栈，提出了基于ARM7TDMI 处理器的μC/OS-II 操作系统上轻型PPP 协议的设计与实现，对μC/OS-II 与处理器相关的代码部分进行了修改与编译，实现了μC/OS-II 在ARM 开发板上移植，为PPP 协议的设计与实现提供了系统软件开发平台。通过编写了PPP 协议main 主模块、LCP 模块、PAP 模块、NCP 模块和PPP 等模块代码，在μC/OS-II操作系统中实现了轻型PPP 协议。通过测试，验证了ARM 开发板的PPP 协议的网络通信功能。关键词 ARM；μC/OS-II；嵌入式系统；移植；PPPAbstract:Aiming at the μC/OS-II Real-time operating system without its own network protocol stack,a light PPP protocol is presented and implemented in μC/OS-II based on AMR7TDMI processor. by modifying and compiling core codes related with AMR7TDMI processor, μC/OS-II is ported in ARM development board, which provides software platform for design and implementation of a PPP. In the end, the article introduces the course of design and implementation of a PPP under the software and hardware platform , including design of main module, LCP module, PAP module, NCP module and PPP module.Test result indicated that light PPP can be realized successfully in ARM development board.Key words：ARM, μC/OS-II, embedded system,porting , PPP