Abstract: [Purpose/Significance] Digital overuse has a negative social impact on user well-being, interpersonal relationships, and work productivity. Exploring the complex mechanisms underlying the antecedents of mobile digital overuse helps users move toward moderate and meaningful human-computer interactions and mitigate the negative effects of digital technology. [Design/Methodology] Based on the framework of digital well-being, this paper constructs a configuration model of mobile digital overuse of Generation Y through exploring the combinations and interplay of personal, device and environment attributes in leading to digital overuse in Generation Y. Empirical data are collected via online survey to Generation Y respondents in China in 2023 with 158 valid responses. The necessary conditions of digital overuse are analyzed by NCA, and the conditional analysis of digital overuse are analyzed by fsQCA. [Findings/Conclusion] Three necessary conditions and four paths leading to digital overuse are found respectively such as digital literacy, perceived usefulness of digital well-being applications, and social digital pressure, and among which gender, fear of missing out, actual digital usage hours, and non-work time electronic communication expectation are the core conditions leading to users' mobile digital overuse. [Originality/Value] This study locates digital overuse behavior from a non-clinical perspective and confirms the asymmetrical nature of mobile digital overuse causality outside of an addiction framework, expanding the understanding of the mechanisms that generate digital overuse.

Keywords: Digital overuse, Generation Y, Digital well-being, Influencing factors, Configuration perspective, Fuzzy-set Qualitative Comparative Analysis（fsQCA）