Objective To study on the psychological health and related influencing factors of military nurses who take part in the Tibetan hospital supporting operation.Methods Symptom checklist 90 (SCL-90), coping style questionnaire and personal evaluation questionnaire were employed in the survey of 75 military nurses who took part in the Tibetan hospital supporting operation.Results The scores of Tibetan hospital nurses in high altitude areas were significantly higher than normal person and soldiers in each factors of SCL-90. The correlation analysis showed that the coping factor of problem resolving in coping style had negative relationship with fear factor in SCL-90 (r=-0.231,P<0.01). Remorse factor had positive correlation with all factors of SCL-90 (r=0.301-0.432;P<0.01),while the total score of personal evalation had negatively related to all factors of SCL-90 (r=-0.308--0.423;P<0.01).Conclusions The military nurses who take part in the Tibetan hospital supporting operation are in a poor mental state which is greatly influenced by the coping style and personal evaluation.