The influence of radar tracking error on the miss distance of the command guided system is studied.Firstly, the radar tracking error is modeled and analyzed.The command guidance loop model with introducing of radar tracking error is established, and the analytical solution of the simplified model is obtained, according to which the relationship between the time and the miss distance caused by radar tracking error is analyzed.Secondly, the complex instruction guidance loop model is studied in detail by using the adjoint method, and the change of miss distance caused by the random error of radar tracking error with the time when the parameter value of each link in the guidance system changes is obtained through simulation.The result shows that:the miss distance of the command guided system caused by radar tracking error increases with the increase of guidance time; and the systematic error is the main factor affecting the miss distance within limits.