To explore the status of undergraduates’WeChat usage and upward social comparison,and analyze the relationship between the above two variables.Totally 754 WeChat undergraduates were selected through poster recruitment from 5 colleges in Guangdong Province.They were investigated with Access Frequency to Social Networking Site Scale(AFSNSS),Upward Social Comparison Subscale of Iowa-Nwtherlands Comparison Orientation Measure(INCOM-USCS).The score of overall emotional engagement(OEE)of AFSNSS and the total standard score of INCOM–USCS(TSSI-U)were(22.41±4.70)and(0±4.5),respectively.The correlation between WeChat frequency and TSSI-U was not significant.TSSI-U was significantly positively correlated with the score of OEE and other items of AFSNSS(r=0.161~0.413,P<0.01).Multiple linear regression analysis showed that The scores of item 1,7and 8 of AFSNSS,as well as family economic status,grade ranking of academic performance(GRAP)and the purpose of WeChat use were postively correlated with TSSI-U(β=.104~.234,P<.05).Class cadre or not and origin were negatively correlated with TSSI-U(β=-.089,-.130,P<.05).Conclusion:It suggests that WeChat usage may be a related factor for undergraduates’upward social comparison.