To conduct research on hydrodynamic characteristics of the plane netfixed on steel frame, a finite element model of the plane net was established with member elements to calculate hydrodynamic loads based on SACS. Comparing the previous calculation results of the truss model and those of the beam model, it is found that the simulation results are similar, which proves that the member model is accurate. This preliminarily study proves the feasibility of simulating the integrated structure that is consists of fixed offshore wind turbine and large steel aquaculture cage in SACS.Furthermore, the member model was used for hydrodynamic loads calculation of the plane net under wave and current. The results show that current velocity, wave height and wave period have a significant effect on the hydrodynamic loads on the plane net.Within the decrease of current velocity, wave height and the increase of wave period, the hydrodynamic load on the net decreases. The influence of wave period is particularly significant, with the certain nodal force difference of up to 80%.For the hydrodynamic load on the net under the action of wave and current, the maximum load appears on both sides of the top position of the plane net, and the wave height has a greater influence on the load at the upper position. These results are expected to provide theoretical basis and technical support for the design of large steel cage in the integrated structure.