Understanding the settlement process of longline gear is of considerable significance for increasing the catch rate of target species and reducing the bycatch of other species. In this study, based on the finite element theory, a three-dimensional dynamic settlement process model of longline settlement was constructed using the lumped-mass method. The wind speed and direction, three-dimensional current data, fishing gear parameters, and operational parameters of 12 sites measured at sea from March 2016 to July 2016 were used as inputs, and the seven level and six order Runge-Kutta method was used to solve the model. The depth and sinking duration of 80 hooks corresponding to the measured sites were calculated and the simulated sinking speed and gear spatial shape were obtained. These data were then compared with the measured data at sea. The results showed that: (1) the established three-dimensional settlement model of longline settlement could be used to calculate the hook depth, sinking duration, sinking speed, and gear spatial shape at the flow velocity in the X, Y, and Z directions of –0.05– 0.80 m/s, –0.30–0.28 m/s, and –0.12–0.10 m/s, respectively; (2) there were no significant differences among the hook depth, sinking duration, and sinking speed obtained using the three-dimensional settlement model and conventionally measured (P＞0.05); (3) the simulated gear space shapes were similar to those of the measured space shapes. The numerical simulation model developed in this study can predict the hook depth, sinking duration, sinking speed, and spatial shape under the interaction of three-dimensional ocean currents and achieve dynamic three-dimensional visualization.