During the operation of the aircraft drag parachute， the aircraft engine is often not shut down. The high-speed engine nozzle flow will have a certain impact on the flow field of the drag parachute， thereby affecting the performance of the drag parachute. To study the influence of engine nozzle flow on the drag parachute， the fluid-structure coupling method is used to simulate the dynamic parachute opening process of the drag parachute under different nozzle velocities. And the effect of different nozzle velocities on the drag characteristics and stability of the drag parachute are analyzed. Research has found that the engine nozzle flow will increase the fluid velocity in front of the drag parachute， which causes the drag parachute’s opening shock peak time to move forward， the opening shock peak value increases， and the average value of the aerodynamic resistance increases. When the nozzle flow velocity is 250 m/s， the average aerodynamic resistance of the drag parachute in the full state is increased by 21%. When the nozzle flow velocity is 350 m/s， the average aerodynamic resistance of the drag parachute is increased by 51%. When the nozzle flow velocity is 500 m/s， the average aerodynamic resistance of the drag parachute is increased by 79%. At the same time， the engine nozzle flow will make the pressure under the inner side of the parachute higher. The asymmetrical pressure distribution of the inner side makes the drag parachute swing up and down. And the greater the nozzle velocity is， the greater the swing amplitude of the drag parachute will be. The nozzle velocity will make the stability of the drag parachute worse.