In this paper, for obtaining the influence of otter board on the mechanical trawl system matching calculation, trawl system mechanical matching calculation model was established based on the equilibrium equation of otter board and tension equation of wire rope, a widely used cambered V type otter board was selected, the hydrodynamic performance experiment data, combining with the data of 'Longteng' vessel and four patch and big mesh size mid water trawl experiment results were taken into the model, calculation and analysis was conducted from the tension of trawl wing tip, to the sweep line, otter board, wrap step by step, the attack angle, warp tension, warp length, net depth and other trawl system parameters value were obtained.The influences of otter board parameters on trawl system operation and force situation was analyzed, and it was proved that:Attack angle decreases with the increase of the drag velocity;warp tension and net depth increases exponentially with the increase of Z coordinate of warp line junction, decreases linearly with the increase of Z coordinate of sweep line junction; attack angle was controlled between 17.77°-18.55°, net depth between 124.3-192.3 m, and warp tension between 40 210-42 219 N via the Z coordinate of warp line junction was adjusted between 0.1-0.6 m;attack angle was controlled between 16.54°-19.85°, net depth between 75.9-679.5 m, and warp tension between 39 533.5-57 933 N via the Z coordinate of sweep line junction was adjusted between -0.4-0.05 m;trawlers loading decreases with the decrease of otter board weight, and be more suitable for shallow operation; attack angle and trawlers loading decreases with the decrease of otter board area, and be more suitable for deep layer operation.The rules of mechanical matching calculation versus otter board parameters were summarized, and the estimation equations were obtained, and reference for correct using and further development of otter board were provided.