Enterprise resource planning (ERP) system serves enterprise to integrate both business processes and information systems with transmission accuracy and real-time requirement. This work presents a completely survey of Taiwan's firms that focus on their implementating packaged ERP system. The objective of this research is to evaluate the information system performance by the DeLone-McLean (D&M) Model of information systems success, to measure the service quality provide by ERP system vendor and consultant presented by Parasuraman, et al. Method of five dimensions of service quality, and also to examine the relationship between service quality and system performance using Structure Equation Modeling (SEM) technique. Finally, the result shows that the enterprises in Taiwan have higher service quality which supported from ERP system vendor and consultant make better performance in ERP implementation.