Influent factors' sensitivity in the huge parachute's deployment load is discussed in this paper. The dynamic model during parachute inflation is based on the inflation time method, the numerical experimentation is designed by orthogonal experiment approach for analyzing the influence and sensitivity of 21 parameters such as initial conditions, recovery object parameters, pilot parameters, main parachute parameters and environment conditions etc. about 5 indexes such as two parachutes' deployment force peak and the dynamic pressure when the main parachute deployed. Four numerical experiment results obtained from four different initial conditions are compared in this paper, the main factors which influence pilot and main parachute's deployment load are presented, and the influent mode of every factor is concretely analyzed.