Abstract: Ommastrephes bartramii is one of the most important economic species, it has an extremely important development potential in today's Marine resources. Its distribution range is mainly concentrated in the Pacific Ocean and its surrounding waters, and it is a kind of organism with important economic and ecological value. O. bartramii can be divided into two breeding groups: winter and spring group (January to May) and autumn group (September to February). Among them, winter and spring population is an important commercial fishing object in Northwest Pacific. The Chinese mainland has been fishing for O. bartramii in the Northwest Pacific since 1993. Subsequently, they expanded the working area and fishing scale of O. bartramii. In recent years, the annual production of the O. bartramii has been declining, accounting for more than 90% of the total production of O. bartramii. As an important prey for large fish and marine mammals in the Marine food web, O. bartramii plays a connecting role in the middle level of the marine nutrient level pyramid, so the change in the number of O. bartramii has a direct or indirect impact on the change in the number of marine organisms at all levels, that is, on the entire marine ecosystem. just another Bayesian biomass assessment (JABBA) requires only catch per unit effort (CPUE) and catch per unit effort. The model can also fit multiple CPUE time series, estimate the process variance of the model, estimate the observed variance of single or group CPUE time series, and determine the fish production function by setting B_MSY/K and its shape parameter m, so it has been widely used. Based on the catch data and CPUE data, the JABBA model was used to evaluate the status of the fish resources in the Northwest Pacific, and the latest relevant data of the fish resources in the Northwest Pacific were used to provide more accurate information and scientific basis for the management of the fish resources. Scheafer model of m=2 was used in this study to evaluate the Northwest Pacific O. bartramii. Moreover, it is assumed that the prior distributions of model parameters obey uniform distribution, and the catchable coefficient q is set to obey uniform prior distribution without information, which is defined as uniform distribution (1×10⁻⁶, 3×10⁻⁵). For environmental tolerance K, generally, its range can be determined according to the multiple of the maximum historical catch of the population, which is defined as uniform distribution (10, 100) (unit 10⁴t), a priori of intrinsic growth rate r. According to the resource resilience of O. bartramii provided by Fish Base website is "high", the range of intrinsic growth rate can be set as uniform distribution (0.6, 1.5). The results show that the environmental tolerance K= 598 100 t, the intrinsic growth rate r is 1.1, and the estimated maximum sustainable yield (MSY) is 158 300 t. The prior and posterior distributions of each parameter converge well. According to the fishing data from 1995 to 2020 in the Northwest Pacific, it is found that the annual catch of O. bartramii ranged from 1×10⁴ t to 4×10⁴t, with the highest catch value in 1999 and the lowest catch value in 2020, and there was a big difference between the highest and the lowest. However, according to the results of the JABBA model, the resources of O. bartramii in the Northwest Pacific have not been overfished, and the resources are in good condition.