For its complexities and randomicities,  it is hard to obtain accurately some important parameters in designing of construction for earthwork project with manual method,  such as traveling density,  queuing condition,  the grade of the road and the number of construction machine.  Actual construction process can be substituted by simulation nodes,  such as digging,  loading,  traveling,  and unloading correspondingly. The technique of Cycle Operation Network (CYCLONE) is used to build the construction model for earthwork project.  The application to an earthwork project shows its shortcut and advantage.  It is worth studying thoroughly and popularizing.