Abstract: Objective To explore the influence of social network addiction and social anxiety on sleep quality of undergraduate nursing students,and analyze the mediating effect of social anxiety between social network addiction and sleep quality of undergraduate nursing students,so as to provide reference for improving sleep quality of nursing students. Methods From September to November 2021,a total of 324 undergraduate nursing students were investigated by using the college students' social network addiction tendency questionnaire,interaction anxiousness scale（IAS） and Pittsburgh sleep quality index（PSQI）. Pearson correlation method was used to analyze the correlation among social anxiety,social network addiction and sleep quality. The logistic regression was used to test the mediating effect of social anxiety between social network addiction and sleep quality,and Bootstrap method was used to verify the mediating effect. Results The total score of sleep quality of undergraduate nursing students was （5.60±2.96）points. The higher the level of social network addiction,the more serious the social anxiety（r=0.429,P<0.01）. The social anxiety was positively correlated with sleep quality（r=0.211,P<0.01）. The higher the level of social network addiction,the worse the sleep quality（r=0.233,P<0.01）. The social anxiety played a partial mediating role between social network addiction and sleep quality,and the mediating effect accounted for 25.05% of the total effect. Conclusion The sleep quality of undergraduate nursing students is poor,the social anxiety is an intermediary variable between social network addiction and sleep quality of undergraduate nursing students,and the colleges and universities should pay attention to the sleep quality of nursing students,provide intervention guidance from social anxiety,to improve the sleep quality of nursing students.

Key words: Undergraduate nursing students, Social network addiction, Social anxiety, Sleep quality, Intermediary role