Confronting the test of international economic competition after China have acceded to WTO, the paper clarified the importance of commercial design of mechanical products By analyzing the factors affecting producs in market competition, it brought forward that the mechanical designer must have basic methods of commercial design and mental diathesis to adapt to market competition

According to the concept of chaos and nonlinear theory,we have made a nonlinear model for the economic competition,the creation and the practical applications can contribute to avoidance of such chaos in real life.