Frequent employee'information security violations have become critical issue in enterprise digital operation management.Based on the person-organization fit theory and social exchange theory,this study investigates the influence mechanism of person-organization fit on employees'information security violations using a multi-case study.The results show that:(1)in the context of enterprise information security management,the types of person-organization fit matching are mainly consistent matching and complementary matching.(2)person-organization fit in the context of enterprise information security management consists of four dimensions:Competence,morality,relationship and emotion.(3)person-organization fit has a negative effect on employee'information security violations,while work engagement and organizational commitment play partly mediating roles in this process.The findings can help enterprises improve information security management strategies and reduce the occurrence of employees'information security violations.