Introduction: The aim of this study is to predict job performance of nurses and medical staff a military hospital based on difficulties regulating emotions and ways of to deal with stressors and stressful.

Methods:. The study population included all medical staff a military hospital in Kermanshah to 138 people formed that sample of 103 people using the Cochran formula were selected by random sampling. For collect research data used of Job Performance Questionnaire, Difficulties in Emotion Regulation Scale and Coping Inventory for Stressful Situations.

Results: : The results by multivariate regression showed problem-focused and emotion-focused coping styles and emotion regulation difficulties components (rejection of emotional responses, difficulty in controlling impulses, a lack of emotional awareness and limited access to emotion regulation strategies) were able to significantly predict job performance.

Conclusion: Can be concluded Influential, Coping Styles and emotional characteristics of the nurses in the field of the job ( including important situations in one's life) which can be cause problems or High abilityon their job performance. So is most important noted this research which managers should try pay more attention to these psychological variables as an important factor in increasing the productivity of their employees.