A project of semi-physical simulation for flight control system is brought forward. This simulation system is based on embeded real time operation system VxWorks,the Simulink model of helicopter is downloaded into PC104 by use of RTW toolbox,in this way, the efficiency and reliability of the semi-physical simulation are improved.The Board Support Package (BSP) for VxWorks is designed to support the embedded computer PC104, and besides, the code generation process is researched, then some key techniques in realization of this project are resolved.