Aiming at the problem of insufficient analysis of the impact of stealth aircraft bombing on the launch of air defense system weapons,a weapon launch front angle error model is proposed.Set the normal flight path and the bomb dropped flight path of the stealth aircraft,extract the RCS (radar cross section) sequence according to the two-dimensional attitude of the aircraft in real time,and combine the radar measurement error model to compare and study the target parameter measurement error under two flight paths.The mechanism of the measurement error affecting the air defense weapon system prediction of the weapon launch lead angle is analyzed,and a judgment criterion for judging the effect of the lead angle error is established.The simulation results show that during the dropping of stealth aircraft,the radar parameter measurement error of the aircraft is small,which makes the prediction of the launch front angle of air defense weapons more accurate,and lays the foundation for subsequent weapons to accurately intercept targets.