This study concerns the Chinese distant-water shrimp-trawl fishery effort which uses four-panel trawl nets with the specification 40.3 m × (20.8-16.2) m. Based on the L₉(3⁴) orthogonal array, the orthogonal experiment of three factors [body length () and meshes of side pannel] in each level was designed to optimization three structural parameters of S/, by analyzing the effect of three experimental factors changing on the level of test resistance of the net, the coefficient of energy consumption, and the coefficient of . The results showed that the resistance of the net was primarily affected by in a descending sequence. The coefficient of energy consumption was primarily affected by in a descending sequence when was the main influencing factor and the main influencing factor of the coefficient of of this type of net should be slightly smaller than used in small-mesh bottom trawls, but in a larger range (0.26-0.38) the change did not show a significant impact on the hydrodynamic performance of the nets. The best level of the experiment was when was the most significant factor among the three factors. And the best level of the experiment was when only needed to meet the height of the net mouth when trawling for shrimp, and given a priority to expand the horizontal distance of the net, was not concerned with the structural parameter of .