BackgroundConsiderable　research　has　investigated　the　influencing　factors　of　cyberloafing　in　the　workplace.　However,　few　studies　have　focused　on　the　antecedents　in　non-work　fields,　especially　for　nurses.　According　to　the　effort-reward　imbalance　theory,　this　study　aims　to　explore　the　spillover　effect　of　after-hours　electronic　communication　on　nurses＇　cyberloafing,　and　the　mediating　role　of　psychological　contract　breach.MethodsA　total　of　282　nurses　completed　the　online　survey.　PROCESS　macro　for　SPSS　was　used　to　test　how　after-hour　electronic　communication　affect　nurses＇　cyberloafing.ResultsAfter-hours　electronic　communication　has　a　significant　positive　impact　on　nurses＇　cyberloafing,　and　psychological　contract　breach　plays　a　mediating　role　in　the　relationship.ConclusionPsychological　contract　breach　was　the　linchpin　linking　after-hours　electronic　communication　to　nurses＇　cyberloafing　in　workplace.　This　study　provides　a　guide　for　healthcare　organizations　to　reduce　or　manage　inappropriate　telework　arrangements　and　strengthen　nurses＇　psychological　contracts.