In order to improve the preload control effect of rotor bolted connection of aero-engine, a torque method for loading target torque based on test data is proposed. In this paper, combined with the characteristics of multiple assembly and adjustment process of aero-engine bolts, the assembly process difference conditions are set, and three torque modification strategies are designed, and experimental research is carried out based on the flange connection disc simulation parts built. The dispersion of the bolt preload obtained under various loading strategies and the deviation from the target preload were analyzed and evaluated, and the improvement effect of various torque modification strategies on the rotor bolt preload control ability under different process conditions was given. It is recommended that for the bolt tightening requirements of aero-engine rotor, the difference in lubrication conditions and tightening times should be considered to improve the target preload, and the target torque correction strategy related to the change of self-locking torque and the number of tightening times should be adopted to regularly calibrate the target torque and avoid no lubrication as much as possible.