In order to solve the problem that perpendicularity and parallelism error of three-axis localizers cause posture alignment error and internal force of aircraft components, the paper introduces a hybrid force position control system for posture alignment platform of large aircraft components. Error model of posture alignment was established to explain the problem. Then the strategy to select axes under position control and axes under force control was proposed based on condition number of mechanism’s Jacobian matrix. Static error calculation indicates that hybrid control strategy may improve posture accuracy and reduce internal force significantly under the given posture alignment condition when 0.05 mm/m perpendicularity error exists on each localizer and the maximum parallelism error was 0.1 mm/m and the averaged parallelism error was 0.07 mm/m between localizers. The experiment indicates that the torque controller follows the desire torque signal properly with disturbing position signal and the dynamic torque error is below 0.03 N·m, which is applicable on real posture alignment platform.