This paper presents an investigation into the influence of bottom deadrise angle on total resistance and free-surface flow characteristics using Computational Fluid Dynamics (CFD) methods. The geometric modeling and input parameter setup for the simulation were conducted using the Orca3D plugin within Rhinoceros. Subsequently, the CFD software Simerics MP was employed to simulate free-surface flow over the hull of a 12-m planing canoe. The simulation results include the free-surface flow patterns corresponding to various deadrise angles and the effects of angle variation from 12 to 24 degrees, indicate a total resistance reduction of approximately 15.1% and identify an optimal range between 20o and 22° for this specific hull.