Abstract: Polycrystalline diamond compact (PDC) drill bits are increasingly used in coal mine drilling due to their efficient rock-breaking capabilities. To better understand how cutting parameters affect the forces on PDC cutters, a singlecutter cutting experiment was conducted. A corresponding cutting force calculation model was developed and validated through simulation. Building on global force balance principles, a MATLAB GUI based software was created to optimize cutter layout parameters. This software was applied to a five-wing flat-bottom drill bit, optimizing the circumferential angle (θ), back rake angle (α), and side rake angle (β) through multi-objective analysis. Experimental and simulation results revealed that cutting depth has the greatest influence on cutting force, followed by back rake angle and cutting speed. Using the optimization software, both lateral force and bending moment on the drill bit were significantly reduced. Specifically, the lateral thrust ratio (lateral force to drilling pressure) decreased to 1 / 1000, and the bending-torsion ratio (bending moment to torque) decreased to 1 / 100. Abaqus simulations further confirmed the effectiveness of the optimization, with the average lateral force reduced by 1. 81 kN and the average bending moment by 0. 163 kN · m, alongside a noticeable reduction in data variability. These reductions in lateral force and bending moment are expected to enhance drilling efficiency. Additionally, the software’ s computational requirements remained stable despite changes in cutter layout parameters. Overall, this optimization software provides an effective tool for improving cutter layout design, thereby increasing the efficiency of drill bit development.