The current research examined social values of the post-90s generation from individual and realistic levels，indicating personal values about how a society should be and shared beliefs about what the society is. The relevant values are collectivism，humane orientation and power equality. The data of 13779 post-90s samples from CASS-Intellvision Social Mentality Survey 2017 was analyzed. The results show that the social values are different between personal and realistic levels，to be more specific，the post-90s believed that a society should emphasize collectivism，humane orientation and the equality of power；while they perceived that the social reality undervalued human concern and power equality. Both levels of social values independently impacted components of social mentality，such as satisfaction with life，social fairness perception，social trust，national identity and social participation. The perceptions of realistic social values play a more important role.