Background and aims: To understand the interaction between problematic smartphone use (PSU) and related influencing factors (individual variables, family environment, and school environment) and to determine the most influential factors affecting the use of smartphones by juveniles to implement effective interventions in the future. Methods: A total of 3,442 children and adolescents (3,248 actual participants (males 5 1,638, average age 5 12.27 +- 2.36)) were included in the study. This study measured juveniles? PSU and its influencing factors: individual variables (4 factors), family environments (13 factors), and school environments (5 factors). This study employed a network analysis approach for data assessment. Results: This study found that there were several central influencing factors (such as self-control ability, loss of control, parent-child relationship, and peer attitudes towards smartphone use) and bridge factors (such as peer attitudes towards smartphone use, peer pressure for smartphone use, and fear of missing out). Discussion and conclusions: Juveniles? PSU included several core symptoms and critical influencing factors. Intervention based on these factors may be effective, timely, and inexpensive. Kulcsszavak: problematic smartphone use, network theory of mental isorder, ecological system theory, network analysis, juvenile