Purpose: The purpose of the study was to investigate the psychological factors such as eating psychopathology, depression, obsessive-compulsion, sleep problem, and stressors that affect the alcohol problems in patients with eating disorders. Methods: Patients with eating disorders (n=347) who visited "M" clinic for eating disorder were participated in the study. Data were collected from February 2008 to May 2010 using Eating Disorder Inventory-2, Beck Depression Inventory, Maudsley Obsessional-Compulsive Inventory, and Alcohol Use Disorder Identification Test-Korean. Results: Of the participants, 17.3% had an alcohol problem, 9.2% of them were diagnosed with alcohol dependency. Age, history of mental disorder in family, stress for love relationship, difficulties falling asleep, and ``impulse regulation`` (one of eating psychopathologies) were significant associated factors of alcohol problem, but depression and obsessive-compulsion were not significant. Conclusion: Future interventions for patients with eating disorders should focus on assessing alcohol problems. Assessment should be non-judgmental, especially for those patients with high levels of impulse dysregulation, difficulties falling asleep, and stress in love relationship in order to prevent their early drop-out for the treatment. Alternative treatment for sleep problem and stress management also may be helpful for the patients with alcohol problem and eating disorders.