The development of efficient and deep fueling techniques is of great significance for meeting the demands of future fusion devices to enhance the burning rate while reducing the tritium breeding ratio. The compact torus (CT) system, based on the principle of pulsed electromagnetic acceleration, can achieve extremely high injection velocities over a remarkably short time and distance. It is therefore considered a highly promising method for central fueling in fusion reactors. Recently, central fueling has been successfully achieved for the first time on the Experimental Advanced Superconducting Tokamak (EAST) via this method with the fueling penetration reaching a normalized poloidal flux radius of (Ye et al 2025 Nucl. Fusion65 084002). However, research on simulating the travel trajectory of CT plasma in EAST and optimizing the injection parameters remains inadequate. This study will further optimize the trajectory-tracking model by refining the representation of the Magnetohydrodynamic drag (), where the constant term is replaced with a position-dependent function in order to improve consistency between the model and actual physical conditions. Based on this improvement, the effects of various parameters on the fueling penetration depth was investigated. The results indicate that the penetration depth increases proportionally with injection speed, CT density and CT magnetic field strength, yet decreases with plasma density in EAST. This trend consistent with qualitative expectations, verifying the model’s qualitative rationality to a certain extent. The optimal injection angles for various injection positions are further clarified through the simulations. Based on the aforementioned model, a key highlight of this study is the detailed simulation of the EAST-CTI upgrade, which targets an injection depth of 0.7, the device objective of the device with core parameters including injection position, angle, CT plasma velocity and density. This work may offer some insights for the future upgrade and modification of the CT injection system in EAST.