This study aimed to a) evaluate the association between Internet addiction and problematic alcohol use; b) based on problem behavior theory, explore whether Internet addiction, as well as problematic alcohol use, correlated with the psychosocial proneness of problem behaviors among adolescents. A total of 2,114 high school students (1,204 male and 910 female) were recruited to complete the questionnaire assessing Internet addiction, problematic alcohol use, and associated psychosocial variables. The result revealed that Internet addiction was associated with problematic alcohol use. Besides, the psychosocial proneness of problem behaviors is associated with Internet addiction as well as problematic alcohol use in adolescents. These results suggest Internet addiction might be included in the organization of problem behavior theory, and it is suggested that prevention and intervention can best be carried out when grouped with other problem behaviors.