At present, both the societal mentality to be cultivated through social psychological services and the corresponding modes of service delivery exhibit nonlinear evolution and multi-actor interaction, respectively. This renders traditional social management centered on linear causal assumptions and uniform standardization more prone to failure. Drawing on complexity theory, this article proposes a dual-complexity analytical framework for the social psychological services system. It argues that societal mentality, as the target of service provision, displays nonlinear emergent properties, whereas the service system, as an institutional arrangement, must rely on self-organization and adaptive capacity to sustain continuous provision. Based on this framework, the article further examines the structural effects of complexity on public policy reasoning, psychological services practice, and the formation of scholarly consensus. It advances three directions for optimization: flexible policy design, proactive service practice, and multi-stakeholder coordination in academic research. Overall, the study offers a conceptual tool for understanding operating mechanisms and improving evaluative logics for research on strengthening the social psychological services system.

social psychological services system, complexity, social mentality, social governance