The business in Taiwan are globalized gradually. In the past time, most of the headquarter and factory of business are established in Taiwan. Then, by considering of the overhead and the needs of market, they moved some factories abroad in droves. The headquarters of Taiwan product some high valuable productions, low value productions be produced in overseas, and then be formed gradually a model of supply chain management. The form become complexity because of business goes abroad step by step. Sometimes they import well-done productions or parts, another time they export productions. At depends on economical comparable benefit in global and the principle of division of labor. For focusing on running own business, Company let the unimportant and low value parts be outsourcing is an apparent trend. The essay is studying of local motorcycle company, and discussing about the factory of outsourcing or producing by themselves within business. Then providing a strategically decision model for manager, and a method of purchase and supplier¡¦s management when make outsourcing. The process of this essay is discussing of the theory of source base, the theory of core ability, producing by themselves or outsourcing, the strategy of purchase, the theory of supply chain management, satellite system, and explain the profile of the motorcycle¡¦s industry, and their business running model and the classifying of motorcycle parts, and the producing method of parts. Finally, providing a method of assessing to be reference materials. Keywords¡Rcore competence , business plan , outsourcing or producing by themselves , decision model