The construction of a public psychological service system is an important part of the social governance. This paper focuses on the use of cyber messages and information technology to intervene and guide the emotions in the individual, organization/group and society (i.e., micro, medium, macro) levels, in the construction of the public psychological service system such as the intervention of individual mood disorders, and guiding group and social emotions. Suggestions are made on how to play the guiding role of the mainstream media, regulate the professional ethics and professional quality of social media practitioners, and standardize the ethical supervision of big data analysis.

cyber message and information technology  /  public psychological services  /  social emotions  /  public emotions  /  social media