Abstract: Design and realization scheme of sensor-node and sink-node in soft and hard were proposed based on the introduction of its system structure,characteirstics and function.This papers deeply researched characteirstice and kernel of the embedded RTOS uC/OS-II,and transproted the uC/OS-II successfully to the controller Nios.The mini type-TCP/IP protocol stack LwIP Realization of LwIP on uC/OS-II was introduced.

Key words: Wireless sensor network, Embedded OS, Rcaltime OS, Nios, Transplant, LwIP