Following with the competitive trend changing continually, how to provide service timely to satisfy of the civilians (customers) would become the administrative principal for the administration system of the public department, which is supposed to aim at heading toward the consumer and service direction. Adopting the convenience sampling way to carry on the questionnaire survey, this research discusses the relation among the service quality、customer satisfaction and staffs cognition. Using both the populace applying for the commercial registrations from Taipei city office of commerce as the external objects and the serving staffs as the internal samples to conduct this research, the result of this research shows that there truly exist significant differences among the expectation of the populace for service level and the real cognitive service、the cognitive service quality and the satisfaction, and the expectation of the populace for the service quality level and the cognition of the administrators (employees) for the expectation of the populace (customers) for the service quality. The findings provide important reference resources for this institution to advance and amend its service quality.