In order to understand the factors influencing feeding habit of walleye pollock (Gadus chalcogrammus) in the Western Bering Sea, the stomach contents composition of walleye pollock collected from the western Shelf of the Bering Sea in summer 2019 was analyzed, and the factors influencing stomach contents composition were analyzed using the generalized Dirichlet multiple distribution model (GDM). A total of five zooplankton taxa, i.e. Euphausiacea, Amphipods, Copepods, Chaeteognths, and Crustacean larvae, were identified in the stomach contents of walleye pollock, of which Euphausiacea and Copepods accounted for 85% of the zooplankton. Cannibalism was prevalent in 29% walleye pollock, in which the number of zooplankton in the stomach reduced with increasing of cannibalism, and walleye pollock with standard length over 50 cm almost only preyed on walleye pollock. The results of GDM showed that gonadosomatic index (GSI)and stomach contents weight of walleye pollock had a significant effect on the stomach contents composition. The proportion of Amphipods, Copepods and Euphausiacea in stomach contents of walleye pollock decreased with the increasing of GSI, while it increased with the increasing of stomach contents weight. The results of this study can provide basic data for further study of the food web structure in the Bering Sea.