The purpose of this study was to investigate the moderating role of conscientiousness personality trait in the relationship between emotional exhaustion and job performance (task performance, organizational citizenship behaviors). The participants of this study consisted of 400 high school teachers in Khuzestan province (260 male & 140 female) that were selected by relative multi-stage random sampling method. The instruments used in this study were Maslach Burnout Inventory (MBI), NEO Five Factor Inventory (NEO-FFI) and Job Performance Scale (JPS). Data were analyzed by Pearson correlation and moderated hierarchical regression. Results showed that emotional exhaustion negatively related to job performance (task performance, organizational citizenship behaviors).Data were analyzed by Pearson correlation and moderated hierarchical regression. Results showed that emotional exhaustion negatively related to job performance (task performance, organizational citizenship behaviors).Data were analyzed by Pearson correlation and moderated hierarchical regression. Results showed that emotional exhaustion negatively related to job performance (task performance, organizational citizenship behaviors).