Abstract:Based on the trawl survey data along the Bering Sea slope in 2002, 2004, 2008,2010,2012 and 2016, all the cephalopods species were selected in this study. With the cephalopods data, we analyzed the cephalopods community composition, determined the dominant species and their spatial distribution in relation to environmental factors in the Bering Sea slope based on the generalized additive model, and quantified the distribution of cephalopods abundance (indicated by catch per unit effort, CPUE) in latitude and longitude. The diversity of cephalopods community was further evaluated according to the ecological methods. The results showed that a total of 20 cephalopods species were identified belonging to 3 orders, 9 families and 15 genera. The highest CPUE of the cephalopod species in latitude was 0.78 kg/km2 at 55oN. The CPUE in longitude fluctuated between 0.3 and 0.7 kg/km2 except that the value exceeded 1.0 kg/km2 around 166.5oW, 171.5oW and 177.5oW. The dominant cephalopod species in the survey area were Berryteuthis magister, Enteroctopus dofleini, Opisthoteuthis californiana, Benthoctopus leioderma, and Rossia pacifica. Among them, there were significant spatial differences in the distribution of dominant species. In the stations east of 172oW, species were mainly dominant species, and there were few other species. In the stations west of 172oW, the CPUE of other cephalopods was relatively high except for Berryteuthis magister and Enteroctopus dofleini. GAM model analysis showed that longitude, latitude, bottom depth, bottom temperature and surface temperature were important factors affecting the CPUE of the most dominant species. The results of cluster analysis showed that there were two main clusters in different regions, and great differences were found in the community diversity index among different clusters.