Error separation and conversion of the missile weapon′s guidance tools are important research contents of hit accuracy evaluation.Firstly,by adopting the working principle of Strapdown Inertial Navigation System (SINS),a real number genetic algorithm is proposed to realize error separation and conversion,and specific implementation steps are given.Then,in order to solve the problems of slow optimization and easily falling into local optimum during error separation,the corresponding strategy is used to improve the genetic algorithm,the mechanism for adjustment of cross probability and mutation probability is set up,and the elite retention strategy is used to effectively improve the accuracy of error separation and ballistic conversion.Finally,a simulated trajectory is used to verify the method.The results show that,compared with the traditional genetic algorithm,the improved genetic algorithm has faster convergence and higher separation accuracy,and the velocity difference between telemeasuring data and measurement data converted to the full trajectory is closer to the true value.