The Public Psychological Service System(PPSS) is complex and hard to construct. Although previous theoretical discussions and practical exploration have delivered some achievement, people still do not establish a unified view on many aspects of PPSS. Indeed, even the Public Psychological Service(PPS) itself remains controversial. In order to further explore the optimal constructing of the system, the present study addressed reflections of the PPSS from multiple disciplines that are closely related to the PPSS. Theoretical reflections base on five perspectives. Social psychological health service is an important part of PPS because of the historical root. PPS is an extension of school psychological health education. From the management perspective, PPS provides a new psychological mothed for social governance. Philosophically, the fundamental value of PPS is human-oriented. Psychologically, PPS should follow the general laws of psychology and pay close attention to social mentality. Sociologically, the role of PPS is to promote human's socialization, and the complexity of society determines the complexity of PPS. Practice reflections contain five aspects. First, some pilot areas perceive PPS as psychological health service and overwhelmingly emphasis on individual psychological health but not macro social mentality. Second, some pilot areas rely too much on psychological professionals, and in terms of the awareness and actions of the multi-subjects of PPS, it is still far from enough. Third, some pilot areas regard PPS as a kind of tool of social risk prevention and control, neglect its aim of serving people’s psychological development. Fourth, some pilot areas focus to resolve specific people’s psychological problems, failing to meet the majority of ordinary people's basic psychological development needs. Finally, excessive emphasis on psychological counseling actually exaggerates the role of psychological counseling in PPS and is also a manifestation of the simplification of PPS. Indeed, PPSS is not only a complex system but also an organic whole. To construct this system, it needs to integrate ideas and use a systemic approach to scientifically arrange all aspects of the system. It mainly includes the following strategies: First, it needs to unify thinking and understanding about PPSS, and establish “people-oriented” values, a goal of “positive development”, a “comprehensive and complete” view of the object, a "scientific and systematic" evaluation idea. Second, it should strengthen organizational leadership, such as form a work leading group led by at least the chief of local administration, clarify the specific responsibilities of each department, and further smooth the operation mechanism. Third, it should sufficiently utilize modern technology to improve the integration and utilization of resources. Such as use the Internet to bring together psychology-related professionals, use the Internet of Things to share the mental instruments and devices, and use big data to integrate various information of the clients. Fourth, it should optimize team building and unite service synergy through enlarging the talent team, attaching importance to professional guidance and strengthening team management. Fifth, it should focus on socialist core values and integrate service content, and infiltrate socialist core values in publicity of psychological health knowledge, psychological health education, and psychological crisis intervention, etc. Last, it should highlight local characteristics and integrate public psychological service into the lives of the masses. The construction of PPSS must be combined with the characteristics of Chinese society, focusing on the in-depth exploration and integration of local cultural resources, and taking a crowd-pleasing approach.