To address the issues of feed perturbation and reflector surface deformation in large radio telescope antennas caused by gravity, wind, and solar radiation, phased array feed technology is employed. By appropriately exciting each unit, the amplitude and phase errors resulting from feed perturbation and reflector surface deformation are compensated for. The performance of Gaussian feeds and phased array feeds under three different conditions is compared, and simulation results indicate that phased array feeds can not only correct the pointing deviation caused by feed perturbation but also compensate for the phase errors caused by reflector deformation, thereby enhancing the performance of the beam. Phased array feeds convert traditional mechanical surface adjustments to electronic surface compensation, which not only improves the performance of the antenna but also reduces resource consumption, making them suitable for large radio telescope antennas.