The sampling trawl of Quantitative sampling of larval and juvenile fish is advantageous for assessing dynamic changes in fishery resource replenishment and population numbers. It provides a basis for decisionmaking to further enhance the sustainable use of fisheries resources. In this study, a flume tank experimental method was employed to investigate the hydrodynamic performance variations of a frustum-type depressor for sampling trawls with different inclined positions (inward, outward, and tilted). Furthermore, numerical simulations using OpenFOAM were employed to analyze the alterations in the flow field around the depressor at different positions. The results showed that the sinking coefficient of the depressor initially increased and then decreased with increasing angle of attack and heel angle, and both reached their maximum values at a heel angle of 5°. The maximum values for inward and outward inclined were 1.75 and 1.77 (α=25°), respectively, and the maximum values for tilt were both 1.78 (α=25°). The drag coefficient gradually decreased with increasing heel angle and increased with increasing angle of attack. The ratio of the sinking force to drag initially increased and then decreased with increasing angle of attack and heel angle. The maximum values were reached at heel angles of 20° and 10° for inward and outward inclined, with values of 3.73 and 3.76, respectively (α=20°). The maximum values were reached at a heel angle of 5° for tilted, with values of 3.67 and 3.71, respectively (α=20°). The pressure center coefficient remains relatively constant at different angles of attack. C_pc gradually increases with increasing heel angle, while C_pb remains constant with increasing heel angle. The flow velocity on the outer side of the depressor decreased gradually as the heel angle increased. Under outward inclination, the boundary layer separation point on the depressor gradually moved toward the leading edge of the plate. In both forward and backward inclination states, the flow velocity decay region at the rear of the depressor gradually expanded as the heel angle increased. This study elucidates the hydrodynamic performance variations of the depressor under different inclination states, providing a scientific basis for further rational installation and adjustment of the working positions of the depressor.