The purpose of the research is to provide an example to analyze process performance forsystem assembly lines of notebook computer plants.The contributions include:1)refininga manufacturing management model for system assembly line;2)benchmarkingperformance indices in system assembly line;3)conducting inefficiency analysis for thefour plants and providing improvement suggestions;4)using simulation method to simulateand evaluate the benefits after the process improvement.Simulations indicated thatsubstantial improvements can be gained if the recommendations are adopted.