Abstract: Objective: To examine the distribution of parental support or restriction types in China and to analyze the associations between different types of parental support or restriction and the 24-hour movement behavior time allocation of children and adolescents. Methods: This study was based on data from the 2024 Survey on Physical Activity Behaviors and Mental Development of Adolescents. A total of 90 982 children and adolescents and their parents from 115 primary and secondary schools in 10 provinces across China participated in the study. Questionnaires were used to assess parental support or restriction and their children’s 24-hour movement behaviors. Compositional data analysis was employed to examine the associations between parental support or restriction and the time allocation of their children’s 24-hour movement behaviors. Results: 1) Among the types of parental support or restriction regarding children’s 24-hour movement behaviors, the proportion of “no support or restriction for any 24-hour movement behavior” was the highest (53.3%, n =48 565), whereas “support or restriction for all 24-hour movement behaviors” accounted for the lowest proportion (1.1%, n =1 002). Regarding specific behaviors, parents paid the most attention to their children’s sleep, while support for moderate-to-vigorous physical activity (MVPA) was the lowest. 2) Significant differences in parental support or restriction types were observed across educational stages (χ²=4 988.006, P＜0.001), parent-child relationship (χ²=235.222, P＜0.001), and family socioeconomic status (χ²=314.734, P＜0.001). 3) Compared with the “no support or restriction for any 24-hour movement behavior” type, parental independent, combined, and overall support or restriction for children’s 24-hour movement behaviors not only significantly influenced the targeted behaviors but also resulted in the reallocation of their children’s 24-hour movement time. 4) Parental “support or restriction for all 24-hour movement behaviors” was significantly associated with increased time spent in MVPA and light-intensity physical activity (LPA) and decreased sedentary time, reflecting a time reallocation pattern characterized by replacing sedentary behavior with MVPA and LPA, which was most beneficial for health promotion among Chinese children and adolescents. In contrast, “sleep support only” tended to produce a time allocation pattern characterized by replacing MVPA and LPA with sedentary behavior and sleep, which was the least favorable for health. 5) Under the “support or restriction for all 24-hour movement behaviors” type, the total amount of daily time reallocation among children and adolescents was the highest, reaching 16.8 minutes. Conclusions: Parental “support or restriction for all 24-hour movement behaviors” is most conducive to promoting a reasonable and health-enhancing allocation of 24-hour movement time among children and adolescents. In contrast, “sleep support only” is the least favorable. It is recommended that parents adopt coordinated management of MVPA, LPA, sedentary behavior, and sleep, shifting from “single-dimension support or restriction” to “support or restriction across all 24-hour movement behaviors”, in order to facilitate the development of healthy lifestyles among children and adolescents.