Abstract： Objective:To investigate the prevalence and risk factors of functional gastrointestinal disorders（FGIDs）among officers and sailors on a long oceangoing voyage.Methods:A total of 307 officers and sailors on a hospital ship undertaking a long oceangoing mission were selected as study subjects and surveyed by the Rome IV Diagnostic Questionnaire for Functional Gastrointestinal Disorders in Adults. The multivariate logistic regression was used to analyze risk factors of FGIDs.Results:A total of 300 valid questionnaires were collected，and the valid rate was 97.7%（300 / 307）. The total prevalence of FGIDs in officers and sailors on the long oceangoing mission was 11.00%（ n=33），among which the prevalence of unspecified functional bowel disorder was the highest（3.33%），followed by functional dyspepsia（2.00%），functional constipation（1.67%），functional diarrhea（1.33%），nausea and vomiting（1.33%），etc. According to the univariate analysis，gender，body mass index（BMI），type of work，times of undertaking oceangoing mission，location of berthing cabin，seasickness，and eating instant noodles were associated with the occurrence of FGIDs（ P<0.05）. The multivariate logistic regression analysis of the occurrence of FGIDs showed that the gender of male was a protective factor，while the decline of BMI and frequently eating mustard tuber were risk factors. Conclusion:The prevalence of FGIDs in officers and sailors on long oceangoing missions is relatively high，and the occurrence of FGIDs is related to gender，BMI，and eating mustard tuber.