Using psychological network analysis, this study explored the heterogeneity of the network structure between extracurricular time‐use and delinquency using a nationally representative longitudinal survey of at‐school students in China (N = 10,279, 47.3% female, average age 13.6, 91.2% Han ethnicity). The results are threefold: First, time stimulation of activities occurs on weekdays, while time displacement and stimulation occur on weekends. Second, delinquent behaviors are positively correlated, forming a problem behavior syndrome. Smoking or drinking is the central delinquent behavior. Third, negative consequences of specific time‐use behaviors are more likely to occur on weekends than on weekdays, and time‐use behavior may function differently on weekdays versus weekends. Among them, going to coffeenets or game‐centers serves as the bridge with the highest potential of triggering delinquency. [ABSTRACT FROM AUTHOR]