To investigate the dynamic change characteristics of Antarctic krill (Euphausia superba) trawling, we conducted sea trials on the krill trawler “Long Fa” of the China Fisheries Corporation from January to April 2020 in subarea 48.2 of Antarctic waters(45°W?48°W, 60°S?61°S). Information was collected on the towing speed, warp length, warp tension, and depth of the net and otter board, and the effects of the warp winding up and releasing speed on the dynamic change of the net were analyzed. The relationships between towing speed, warp length, net mouth opening height, warp tension, and net position were also examined during the stable towing stage. The main results are as follows: (1) the average speed of the shooting net stage was (2.96±0.36) kn and the average speed of the hauling stage was (1.35±0.26) kn. (2) The warp releasing speed was (54.1±5.9) m/min in the natural sinking stage, and the warp winding up speed was (47.15±7.02) m/min in the pursing stage. (3) The warp tension decreased gradually with the increasing of the warp releasing speed, which is proportional to the net position sinking rate. (4) The warp winding up speed was inversely related to the warp tension. The warp tension of the upward adjustment stage was larger than that of the pursing stage. As the warp winding up speed increased, the net mouth opening height increased. (5) During the stable towing stage, the towing speed and the warp length had a significant influence on the net mouth opening heigh. As the towing speed and warp length increased, the net mouth opening height decreased. (6) In the natural sinking stage, when the warp releasing speed was too high and the net sinking speed increased, the phenomenon of “overshoot” occurred. These results can inform adjustments to the net position during Antarctic krill trawling and improve the efficiency of future trawling. They also serve as essential data for the verification model test and numerical simulations of the performance of a mid-water trawl.