Objectives; the purpose of this research is to obtain a high prevalence disease list during the deployment period of the cheong-hae unit and do an analysis of factors affecting incidence rate. Methods; 301 Navy Crews were deployed for 201 days, total medical records were retrospectively utilized, and we compared the disease’s incidence rates with that of the general population. Independent variables are age, department, exercise time, smoking, bed place, duty schedule, and clinic visit period. To Compare the variables, we used х² test and Logistic Regression Test. Results; Most high prevalence disease was upper respiratory disease, which was linked to the clinic visit period. and sleep problem was revealed to be the most high risk ratio compared to the general population. Trauma and musculoskeletal diseases show no difference among clinic visit period but we observed very high incidence rate in ‘Cooking Department’. Duty schedule has a correlation to Gastro-intestinal Disease. smoking is revealed risk factor of dental problem and head & neck musculoskeletal disease. Conclusions; There are many factors affecting a disease’s incidence rate. This findings offer basic reference for preparing Cheong-hae unit deployment and enhancing the Navy Crew’s health by preventing the high prevalence disease.