As competition in the workplace intensifies, employees are experiencing increasing stress in both the work and family domains, and Work-family conflict is becoming an increasingly common problem. In view of this, this study explores the impact of FSSB on employees' Work-family conflict through a survey of 220 employees at two time points based on conservation of resources theory and boundary theory. The results showed that FSSB had a significant negative effect on Work-family conflict; FSSB mitigated Work-family conflict by increasing employees' perceived boundary control; and employees’ conscientiousness positively moderated the effect of FSSB on perceived boundary control, which in turn moderated the indirect effect of FSSB on Work-family conflict through perceived boundary control. Highly committed employees have a higher perceived boundary control with the help of FSSB, which in turn mitigates Work-family conflict. The findings of this study provide a solution idea with theoretical and practical implications for organizations to mitigate Work-family conflict among employees.