“…Compared with typical developing children/adolescents, underprivileged individuals living in disadvantaged socio-cultural environments (e.g., orphans, de facto unattended children/adolescents, "left-behind" children/adolescents, "single-parent" children/adolescents, and children/adolescents in especially difficult circumstances) experience greater psychiatric burdens and suicidal risks, 19 but are more likely to "dropped out" from primary healthcare systems, as the fact that healthcare centers or service providers are geographically limited to economically developed urban areas, as well easily accessed for children/adolescents who are under well-parenting only. 20,21 Therefore, we still need evidence to show whether underprivileged children/adolescents in LMICs equally benefit from psychological healthcare, examining whether such system provides equitable mental health rights int he real-world practices. In June 2022, the Nanchong, one of biggest lower and middle-economic-status city including over 60% children/adolescents who are in underprivileged conditions in the western China, instigated a citywide primary psychological healthcare system (the Psychological Health Guard for Children and Adolescents Project of China, CPHG) for all eligible children/adolescents, especially in five underprivileged cohorts (i.e., children/Adolescents in especially difficult circumstance, CEDC, "Single-parenting" children/adolescents, "Left-behind" children/adolescents, de facto unattended children/adolescents and orphan).…”