This paper aims to solve the problems that the parachute cord entangles the parachutists’ limbs in the parachute process of a certain type of airplane. By reforming the design of the pack methods of the main battle drogue parachute for our airborne troops, the structure micro modifications on the second level opening drogue parachute were done based on not doing harm to the main pack methods of the main parachute to achieve drogue parachute external package, and to make the drogue parachute system a part of the opening main parachute pack to indirectly shorten the cord length reserved on the parachute cable in the airplane. After changing the pack methods of the second level drogue parachute, the parachute-opening cord length reserved on the parachute cable was shortened to 600 mm (reduced by 1500 mm), which enlarged the distances between the cord affected by the airplane wake to throw inward and the parachutist deplaning in the instant, and ensured both of them were no longer bound to each other. The parachutists had no more the cord entangling the limbs accidents in a certain parachute by ground simulation and air experiment, which guaranteed the parachute safety. In conclusion, the modification design scheme is feasible.