Abstract： Objective To evaluate the sleep quality of the Chinese scientific expedition team members during circumnavigation of the Arctic and Antarctica.Methods The team members that participated in the 33th circumnavigation of Antarctica and the 8th circumnavigation of the Arctic were enrolled for the study.During deployment,their sleep quality was evaluated by Pittsburg Sleep Quality Index (PSQI) and intelligent bracelet.Then,the obtained data of sleep quality were compared between the shipcrew,scientific personnel and other comprhensive personnel.Results After circumnavigation,the PSQI scores of the expedition team members increased to various extents,as compared with those before circumnavigation,and this was particularly the case with the scientific personnel and other comprhensive personnel (P ＜ 0.05).The elevated scores of sleep disorder after circumnavigation were as follows:(2.05 ± 0.63) scores for the shipcrew,(2.25 ± 0.53) scores for the scientific personnel and (1.89 ± 0.70) for the comprhensive personnel,while the scores of sleep disorder before circumnavigation were respectively (1.32 ±0.41),(1.15 ±0.53) and (0.41 ±0.42) in sequence order.Statistical signficance could be seen,when comparisons were made between them(P ＜0.05).Intelligent bracelet detection revealed that the time of deep sleep was significantly shortened,especially among the comprhensive personnel [(61 ± 10)min vs (80 ± 15)min)],and statistical signficance could be noted,when comparisons were made (P ＜ 0.05).Conclusion The sleep quality of the scientific expedition team members during circumnavigation of the Arctic and Antarctica was relatively poor,for which measures should be taken to improve their sleep quality.