) is one of the largest single biological resources on the earth, its largebiomass and potential to support a large fishery has received increasing attentions of many countries. China began to be involved in the Antarctic krill fishery in 2009 when two large scale factory trawlers from Chinese fishing enterprisers went down to the Southern Ocean for exploratory fishing. At the beginning, large mesh size trawl net redesigned based on Chilean Jack Mackerel trawl was used, and the fishing efficiency was not satisfactory due to poor match between the net and the trawl doors, consequently the catch was much lower than those of Norway, Korea and Japan fishing fleets. In 2010, Chinese fishing vessel introduced 192.60 m×110.50 m krill trawl, a small mesh size specialized krill trawl from Korea, and fishing operation indicated that catch was also not satisfactory because of the limitation of the opening of net mouth. This was changed in 2012 when Liaoning Province Dalian Ocean Fishery Group of Corporations introduced the specialized krill trawler “Fu Rong Hai” from Japan and used the Japanese krill trawl ( m small mesh size krill trawl) on board the fishing vessel, and the catch increased greatly. This study analyzes the performance of the two krill trawl nets described above, i.e., Korean krill trawl (referred to as Net B) and the Japanese krill trawl (referred to as Net A) by carrying out model experiment based on the Tauti’s law. Large scale ratio λ of the model net was chosen as 14 and 16, respectively, for Nets A and B. The average small scale ratio of the model net was 3; the ratio of towing speed between the full scale and the model net was 3. Model experiments were conducted in the towing tank of the East China Sea Fisheries Research Institute. The towing speeds of the model net ranged from 0.345 m/s to 0.685 m/s with the interval 0.085m/s (equivalent to 2.0–4.0 kn with the interval of 0.5 kn for the full scale net). The ratio of the distance between two lower wing ends to lead line length () ranged from 0.4–0.55 with the interval of 0.05. During the model experiment, drag and net mouth height at varied towing speed and level were recorded, and the drag, mouth height and energy consumption coefficient of the prototype net were recorded at corresponding towing speeds according to model conversion rules and the hydrodynamic performance of the net was analyzed. The results indicate: (1) the drag of Korean krill trawl (192.60 m×110.50 m, Net B) was lower than that of Japanese krill trawl (185.40 m×128.50 m, Net A); (2) Japanese krill trawl was superior to Korean net in opening performance (net mouth height, swept area), economical efficiency (energy consumption coefficient) and filtration (hydrodynamic performance); (3) the net mouth and net body of both model nets remained stable in the water during the tank tests, and body of nets was when towed in the tank; (4) the drag of full-scale trawls could be calculated as:0.24R_e^-0.5for Japanese krill trawl (Net A),0.177R_e^-0.54for Korean krill trawl (Net B) ande^-0.52for the combination of the above two trawls .