In order to investigate the influence of different initiation positions on the directed performance of fragments,the numerical simulation for an assumed directed fragment warhead was conducted by using ANSYS/ LS-DYNA in this paper. The numbers,average velocity and kinetic energy of fragments as well as their enhancements in directed area in different initiation positions were obtained. The influence of different initiation positions on the directed performance of fragments was analyzed. A preferable initiation position,which was easy to achieve in engineering,was proposed.