Abstract: To address the requirements of high-G simulation in flight simulators, this paper proposes a G-load simulation algorithm based on motion parameter planning. By establishing a dynamic relationship model between the angular velocity of the main arm and the G-load values, analytical solutions for the motion equations in the ascent and steady phases are derived. For the parameter-solving challenges in the unloading phase, a database containing G-load, G-load rate, and angular acceleration is constructed, and linear interpolation is employed to resolve data incompleteness. Experimental results demonstrate that the proposed algorithm achieves lateral-directional errors as low as 10⁻¹⁶ g in unidirectional G-load simulation, with anteroposterior and cephalocaudal errors surpassing existing literature. In triaxial composite G-load simulation, although errors fluctuate with increasing G-load rates, all axial errors remain strictly within the thresholds specified by simulation training standards, exhibiting excellent dynamic tracking precision. The proposed algorithm significantly outperform traditional methods such as the Jacobi elliptic function approach and two-dimensional interpolation. The analysis validates the algorithm’s superiority under varying G-load rates and multi-axis coupling conditions, providing an effective solution for high-precision dynamic G-load simulation.