Electronic Industry is the leader of Taiwan manufacturing industries. Recently, the Electric Manufacture Service (EMS) of Taiwan has adopted the American professional model. In electronic products, Print Circuit Board (PCB) is a key important component with high reliability. Print Circuit Board is a customer-made product possesses unique manufacturing features, such as high quality, complicated and protracted manufacturing process, etc. The aim of this study is to evaluate whether the correct selection of the PCB supplier by the Supplier Evaluation Department is of utmost importance in assisting the establishment of a successful business among the electronic manufacturing service companies that utilizing the professional knowledge and techniques in the EMS value chain. This study integrates the management designs from ISO 9001, QS9000 and TQM to provide the evaluation system for PCB products. The related literatures were applied to the whole evaluation methodology, divided into Quality System and Processing Control. Using the Processing Control as the center, it breaks up all the product-related functional departments and processing procedures of PCB into units. According to the long-term PCB supplier evaluation experience, this study details the common mistakes and evaluation standard of each evaluation item. It also provides the related flow-charts for supplier evaluation process. The major differences of evaluation methodology between electronic and traditional industries are evaluated. Major conclusions and suggestions are obtained by simultaneously collecting a large amount of secondary information in the field, and in depth interview with the middle and high levels managers of the PCB factories. The major conclusions and suggestions are as follow: 1. Coordinate with purchasing strategy Establish an effective supplier evaluation system to select the most suitable supplier both in the quality- and cost-controls. The ordinary EMS factories will receive OEM orders of different PCB technical levels and products from different customers. This system could help finding the most suitable supplier for the job. 2. Obtain the best quality assurance for the final products According to the validation of the in-field evaluation, this study separates the analytical results into four categories. It concludes a variant table based on the levels of evaluation, manufacturing capability index and product usage. This variant table will recommend the most capable supplier in accordance with the different PCB technical levels. 3. Minimize the variation of evaluation personnel This study details the common mistakes and the evaluation standard of each evaluation item providing references to the EMS or ODM companies. After several in-field trainings, the variation of the evaluation personnel can be minimized to the least. 4. Improve the managing and manufacturing capability of PCB supplier Select the best part of the QS9000 management techniques as the references for PCB supplier to conduct the Six Sigma or Business Process Improvement (BPI). In order to improve the managing and manufacturing capability of PCB suppliers, this study suggests conducting the practical execution and prevention methods and continuous improvement activities. Through these action plans, it can decrease the unqualified rate and rejected cost, improve the management constitution, become the world-class manufacturing factories and obtain high profit.