In this paper, firstly the development of embedded TCP/IP stack is introduced. μC / TCP-IP is chosen as the entry point for research and development,there is a particular analysis for the process model, the management of buffer and memory, the API of μC / TCP-IP, the efficient memory management mechanism of the μC / TCP-IP is the distillation of design. Secondly, the kernel of embedded RTOS μC/OS-II is analyzed and the process of how to transplant μC/OS-II to the LPC2368 platform is primary expatiated on. Thirdly, the implement of μC / TCP-IP stack.