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Stress is applied to the collection of somatic, emotional and mental reaction, which can disturbed the equilibrium in human beings. One type of stress is work in dependent stress environment, which can affects on personnel due to its internal stressful factor. The object of this research is to investigate the rate of stress in operating room personnel and its relationship with some relevant factors. The present study has been done on 104 personnel of operating room in hospitals belong to the Gorgan Medical Sciences University. The tools for collection data were questionnaire, which contained demographical variables, physical and mental environment stress factors in operating room life stress scale. The results from this investigation indicated that 54.4% of all personals had a mild stress. The stress factors present in the operation room were inconvenient smells the highest with 76% uncooperated team work was the other factor with 29.7% and personnel equipment was (42.6%) it become clear from this investigation that there is a reverse between stress and demographical variables, of stress has a meaningful relationship with age (P=0.01) and years of service in the operation room which means as the age and working in the operation room increased the level of stress decreased. According to the results from this investigation it is suggested therefore to use the old and well-experienced staff to work in the operation room to avoid such problems.