To improve the antiload disturbance ability of permanent magnet synchronous motor (PMSM) for aircraft electric evaporation cooling system under different operation conditions, the load torque feedforward compensation control strategy was studied. A control method based on reducedorder load torque observer was presented. Engineering design method was introduced for the reducedorder load torque observer. The observed load torque was used for compensation of the motor current loop controller to realize quick response to load disturbance and improve disturbance resisting ability. Simulation and experiment results verified the correctness and effectiveness of the reducedorder load torque observer′s design method and the feedforward compensation strategy of PMSM.