Based on false target jamming theory, ballistic target motion theory in re-entry phase and radar scat. tering characteristics, a concept model of non-power heavy decoy with reference to aerodynamic drag coefficient isproposed. And a kind of accompanying heavy decoy in ballistic missile penetrating re-entry phase, with the samesize, much smaller volume and lighter weight is designed, which combines with the domestic and foreign researchstatus. And in consideration of the effect of warhead resistance coefficient, accompanying in ballistic missiles re-en. try phase is realized by morphological change instead of engine adjustment. Also, a structure of passive radar jam.ming component is established by calculating performance parameters of the core component. At last, the radar scat.tering characteristics of the core jamming components are simulated and experimentally tested, which provides thetheoretical basis and data support for the research onaccompanying heavy decoy in ballistic missile penetrationre-entry phase.