To characterize representative characteristic pulse under a collision test condition and clarify corresponding occupant injury response characteristics， a feasible method of characteristic pulse processing based on pulse data from four vehicle types under 50% frontal overlap with the Mobile Progressive Deformable Barrier （MPDB） test condition was proposed. Firstly， the distribution regularity of characteristic parameters of four vehicle types was summarized and analyzed. Samples were then subjected to time normalization and acceleration feature averaging processing， followed by time scaling to maintain pulse shape characteristics and continuity， resulting in the characteristic pulse of the MPDB test condition. Subsequently， based on the principle of momentum conservation， the characteristic pulse was equivalent to a double trapezoidal wave to meet the application stability requirements of sled testing and simulation. Finally， through the simulation of occupant motion response and injury using the MPDB characteristic pulse and equivalent double trapezoidal wave， a minimum difference of 1% in occupant injury parameters was observed. The results indicate that time and intensity obtained by the normalized feature averaging method can conform to the characteristic parameters of the pulse samples， and the equivalent double trapezoidal wave can effectively capture occupant motion injury response under the characteristic pulse.