As a demand quality and satisfaction analysis tool, the KANO model has deficiencies in analyzing the impact of satisfaction. The work aims to use the KANO model and the potential customer satisfaction improvement index (PCSI index) in a mixed way to fill the limitations of the KANO model. Through clarifying the relationship among the KANO model, customer satisfaction coefficient, and PCSI index, the mixed use mode of three tools in service design was explored to provide a process division of labor for investigating and analyzing the impact of customer demand quality and satisfaction in service and make an empirical study on the implementation of college students' mental health service. The mixed use of the KANO model and PCSI index can more deeply and comprehensively analyze the customer demand distribution, satisfaction level, and the influence relationship between them. According to the investigation, there is a large room for improvement in meeting students' needs and improving satisfaction. The research believes that the inclusion of anonymous counseling services has a potential effect on improving satisfaction, and can promote the transformation of service organizations to caring for students.