The purpose of this study is to develop a bus service customer appraisal system. Referring to the current bus operating system, this study utilized integrated system thinking to investigate passenger expectations, drivers' service attitude, bus company considerations and government subsidies. Based on this investigation and consumer-oriented theory, customer vote and detour subsidy systems were proposed. Through study of in-depth interviews and questionnaire analysis, the results show that a customer appraisal system is not only easy to understand and to implement, but can relieve stress and bring benefits to all related groups.