With the recognition of social networking sites (SNSs), the issues of SNS addiction are increasing. analysis has disclosed the association between SNS addiction and irrational procrastination. However, the mechanism underlying this relation remains unclear. the current study aimed to look at the mediating role of social networking website fatigue and also the tempering role of gruelling management during this link among Chinese undergrad students. The Social Networking website Addiction Scale, Social Networking Service Fatigue Scale, gruelling management Scale and Irrational Procrastination Scale were completed by one,085 Chinese undergrad students. Results indicated that SNS addiction, SNS fatigue and irrational procrastination were absolutely related to with one another, and negatively related to with gruelling management. more analyses disclosed that, SNS addiction incorporates a direct result on irrational procrastination. SNS fatigue mediate the link between SNS addiction and irrational procrastination. each direct and indirect effects of SNS addiction on irrational procrastination were qualified by gruelling management. Specifically, this result was stronger for folks with lower gruelling management. These findings facilitate clarify the mechanism underlying the association between SNS addiction and irrational procrastination, that have potential implications for intervention.