In this artic1e，multiple independently targeting is reduced to a problem of one-dimensional explicit guidance and then problem of making attacks on ground-targets are discussed. Our discursion is divided into two parts. The first part is concerning the reduction to problem of one-dimensional guidance. The earth is taken as a symmetrical spinning globe of spherical shape and problems on form of optimal guidonce taw of Mayer realtime guidance，implementation of guidance and power cut-off are discussed. In the second part，combining explicit guidance with impulsive discharging of sub-warhead for attacking multiple targets distributed around the point of impact of the loaded missile is discussed and relevant formulos for computation are derived. Omnibearing independent guidance is brief1y mentioned as a speciaI case of explicit guidance of sub-warheads.