Knowledge-based economy time approached, has formed a reform wave of unrest to the modern enterprise. No matter what kind of enterprise, nearly wish they can use the knowledge to realizes the dream about enterprise innovation and eternal business. The purchases works is the major cost of the general manufacturing production, needs to guarantee the enterprise earnings maximized by the effective management. This research plan to analyze and discuss the feasibility about knowledge management application on engineering outsourcing of purchases procedure in the enterprise. The engineering outsourcing is dazzling, if the enterprise has not make a systematic plan before purchase, it will cause many problems in purchase process. Even after purchased will not meet the demand and unable situation of the use. In the past, the well-experienced engineering supervisor conducted all the plan of outsourcing project. As the matter of fact, the monitoring criteria between different supervisors are not consistent. Therefore the supervising quality wills effects the outsourcing progress and the cost transparency seriously. A good engineering plan shall define the engineering specification as clear as possible so that the suppliers can establish the quotation more transparently in accordance with the engineering specification. Due to transparent purchasing process, the supplier¡¦s quotation will not be exaggerated and the cost will be controlled easily, therefore the loss will be controlled in the reasonable edge. Facing the inquiry and bargain, the purchaser and purchasing supervisor determine the most beneficial choice in accordance with the accurate planning so that the cheating occurrence will be decreased as well. How to make an excellent engineering project? Except organize an excellent engineer team. And we need to use the modern knowledge management theory and supply the suitable information technology assistance to achieve the goal of knowledge inheritance. With the systematic accumulation, expanding and transition process, the freshmen can take over the engineering knowledge and then they will make the outsourcing process more transparent and decrease the unreasonable cost loss. This research via knowledge management related literature discussed, reorganizes the major five activities of knowledge management. And via depth interview method discovered that the engineering purchase related people were hold the positive attitude and willing to accept the knowledge management induct into the purchase process system. Moreover, this case needs construct the platform of knowledge management about engineering purchase related. According to this research, we trust that it may provide the correlation company a reference to induct knowledge management system of the engineering purchase.