beam trawl is a pivotal part of the continuous pumping system for Antarctic krill. To investigate the influence of the structure and components of the beam trawl on the hydrodynamic performance of the trawl, three types of trawl mouse sizes were designed by reducing the number of mesh in the abdominal part of the trawl and shortening the footline length based on the premise of the same horizontal expansion of the back of the net opening, with a beam length of 20 m and footline lengths of 20.0 m (No.1), 18.2 m (No.2) and 17.6 m (No.3). Model nets were made according to the Tauti similarity criterion, and model tests were conducted under three sink force conditions and five towing speed. The results showed that the sweeping area of No.3 net was similar to that of No.1 net under the same towing speed and sink force conditions, and the sweeping area of No.2 net was smaller. The effect of sink force on the resistance, net opening, and sweeping area of the team trawl was highly significant (P < 0.01), there was no significant effect on the energy consumption coefficient, and the vertical expansion performance of the net could be improved by increasing the sinking force appropriately; The effect of drag speed on the resistance, net opening, sweeping area and energy consumption coefficient of the net was highly significant (P < 0.01), and the resistance of all three net mouse structures showed a power function relationship with drag speed, with exponents ranging from 0.7784 to 0.8593, and the slope of increasing resistance varied less. In summary, the shortening of the length of the lower outline of the Antarctic krill beam trawl is conducive to the improvement of the vertical expansion performance of the Antarctic krill beam trawl, the improvement of gear stability, the increase of the effective area swept by the trawl, and the improvement of the comprehensive fishing efficiency of the gear.