Introduction: In recent years, the eating disorder as a psychosocial disorder has increased dramatically and this disorder has an important role in reduction of physical and mental health. This research aimed to predicting of nursing students' eating disorder based on alexithymia, coping styles and cognitive emotion regulation. Methods: This study was a descriptive from correlational type. The research population was the nursing students' of Islamic Azad University of Ahvaz branch in 2017-18 years which from them 210 student (29 man and 181 woman) were selected by stratified randomly sampling method. All of them completed the questionnaires of eating disorder, alexithymia, coping styles and cognitive emotion regulation. Data was analyzed with using SPSS-21 and by Pearson correlation and multiple regression with enter model methods. Results: The findings showed that alexithymia (r = 0.173), avoid-focused coping style (r = 0.198) and negative cognitive emotion regulation strategies (r = 0.465) had a significantly positive relationship with nursing students' eating disorder and problem-focused coping style (r = -0.376) and positive cognitive emotion regulation strategies (r = -0.541) had a significantly negative relationship with nursing students' eating disorder. Also, the variables of positive cognitive emotion regulation strategies, negative cognitive emotion regulation strategies and problem-focused coping style significantly could predict 45.5 percent of variance of nursing students' eating disorder that in this prediction the share of positive cognitive emotion regulation strategies was higher than other variables (P < 0.05). Conclusions:The results indicate the role and importance of the variables of positive and negative cognitive emotion regulation strategies and problem-focused coping style in predicting nursing students' eating disorder. Therefore counselors and therapists should pay attention to the signs of mentioned variables and based on design and implement appropriate programs to decrease the nursing student's eating disorder.

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