Abstract: The impact process of an Airbus A320 airplane upon a rigid target under different initial impact velocities was simulated numerically with LS-DYNA analysis software. Comparing the impact load results of numerical simulated and calculated directly with the modified Riera equation, the correction coefficient <i<α</i< was determined for both of the modified Riera impact load equation and the impact load engineering model. According to the impulse ratio of the crushing load to the impact load, the coefficient <i<γ</i< was determined for the engineering model. Moreover, the empirical formulas to predicate and the coefficient <i<γ</i< in the impact load engineering model under different initial impact velocities were proposed, respectively. Results show that, the impact loads calculated with the engineering model are matching with the numerical simulation results, verifying the rationality of the impact load engineering model and providing a basis for the impact load curve of the Airbus A320 airplane and the other large commercial aircraft similar to A320.