Objective To study the relationship between sleep quality and coping styles of officers and soldiers during long voyage,so as to provide reference for follow-up psychological service support.Methods A total of 196 people during the mission of escort fleet were selected by random cluster sampling.The sleep quality was assessed by the Pittsburgh Sleep Quality Index(PSQI).The Simple Coping Style Scale(SCSQ)was used to analyze the coping styles.The correlations between sleep quality,time to fall asleep,and coping styles were investigated.Results After 16 weeks of escort mission,the detection rate of sleep disorders was 50.57%,and the total score of PSQI was 8.51±2.34,which was significantly different from that before the mission(6.65±3.21)(P<0.05).The total score of PSQI,sleep time,sleep efficiency and daytime dysfunction were significantly negatively correlated with positive coping style,while time to fall asleep and sleep disorders were significantly positively correlated with negative coping style.Conclusion The sleep quality of subjects decreases significantly during the escort mission,and relevant interventions are needed.Positive coping styles are negatively correlated with sleep problems.Psychological intervention should be strengthened to guide officers and soldiers to select appropriate positive coping styles.