Abstract: To improve the impact force equation of aircraft crashing upon the concrete target, it's supposed that there is a crushing region in front of aircraft when colliding. Using stress wave theory to analyze the formation mechanism of crushing region and calculate the interval length and using conservation of momentum principle to derive impact loading equation of aircraft with a crushing region. The calculation and derivation indicate that because of the existence of the crashing region, the length of the region and the velocity distribution determine the quality coefficient of impact force equation together. The coefficient range under different velocity distribution was calculated and the rationality of different coefficient range was analyzed. Through the above calculation and analysis, a new impact force equation of aircraft crashing upon the concrete target can be accurately given.