Abstract: The precision of a trajectory identification algorithm of a course correction fuze based on the velocity-time data of the projectile ascending trajectory is studied. The reason of the projectile dispersion is analyzed and the initial velocity and elevation angle are taken as the initial parameter to formulate the random mathematic model. Based on the theory and method of Monte Carlo simulation, random trajectory is computed by solving the ballistic equations with random initial parameter inputs. The calculated trajectory is identified by the trajectory identification algorithm. The error of the algorithm can be obtained by comparing the ranges of the identified trajectory and the calculated trajectory. The conclusion is that the precision of the trajectory identification algorithm is better than 0.1%.