| Ommastrephes bartramii and Gonatopsis borealis are distributed in the confluence of cold and warm water mass in the North Pacific Ocean, they are important preys for large marine animals, and their beaks are remained in the stomachs of their predators. Therefore, studying the growth characteristics of their beaks can provide a scientific basis for species identification. In this study, the samples of O.bartramii and G.borealis were collected by the Chinese squid jigging vessels during September to November in 2018 in the high seas of North Pacific Ocean (154°05′~159°43′E，41°05′~43°45'N). Their beaks’ characteristics were measured and analyzed. The results showed that the two species had extremely significant differences in mantle length and body mass(P < 0.01). The principal component analysis showed that upper crest length (UCL) was best for representing the beaks’ external morphological features of O.bartramii, upper crest length (UCL) and lower lateral wall length (LLWL) were best for representing the beaks’ external morphological features of G.borealis. The AIC (Akaike's information criterion) showed that the relationships between ML and UHL, LHL, LLWL, LWL were best described by power function for O.bartramii, and relationships between ML and UCL, ULWL, UWL, LCL were best described by logarithm function for O.bartramii; Relationships between ML and UHL, LRL and LLWL were best described by power function for G.borealis,relationships between ML and UCL and LCL were best described by exponential function for G.borealis, and relationships between ML and URL, ULWL and LHL were best described by logarithm function for G.borealis. Stepwise discriminant analysis showed that the correct rates of upper and lower beaks were 92.70% and 84.50%, respectively. Meanwhile, the discriminant functions were built in this study. The results indicated that the external shape of beaks can be effective to identify these two kinds of squids.