To explore the relationship among college students' loneliness, negative affect and mobile phone addic- tion. Totally 359 college students were selected and asked to complete the UCLA Loneliness Scale, the Negative Affect Scale, and the Mobile Phone Addiction Scale. The results showed that ,;cores of mobile phone addiction be- tween genders, majors and siblings had not significant differences. There were significantly positive correlations a- mong loneliness, negative affect and mobile phone addiction. Negative affect fully mediated the relati...