Future airspace window is a new method for fire shooting

and the aiming-points configuration for it is a key point to solve for practical shooting operation.To describe the ammo dispersion decided by aiming-points configuration

the intermediate function is adopted.A function approximation method with derivative-free optimization is used to optimize the configuration parameters

with the distance norm of the intermediate function and that of the optimal intermediate function set as an index

so that the kill probability under the given configuration can approximate its upper bound.With mesh configuration and circular configuration as examples

the proposed approximation method and an analytical method are respectively applied to solve the aiming-points configuration parameters

as well as the kill probability

in different relative errors.The results show the advantages of the approximation method in more approaching the upper bound of kill probability and more universal in applications.