The research use the dynamic simulation soft program of "SIMPROCESS" try to assisting establish a hierarchical model. Discuss the supply-demand buying behaviors of upper structure suppliers of Taiwan high speed rail C291 stake from Steel、Steel、tendon、and concrete. We collect every factors and reasons about damaging the Supply Chain and offer appearing procedure in whole model in way of dynamic simulation. Multi-objece weight laws search the solution of optimization and Search the best special project purchase plan. Based on research, we can provide the solutions for any business and enterprise need to do construction project when they facing the complex Supply Chain problems.