Abstract: Throwing jammer to target area by using projectile as carrier needs the completion of a series of actions such as gun launching, chamber opening in air, landing and antenna deploying to carry out successive work effectively. The composition and operation process of the expendable jammer are described in this paper. Engineering design includes the means of simulation analysis, structure design optimization, structure design innovation, adopting encapsulation technology, combining static and dynamic tests. Test results show that the jammer can operate reliably and effectively. The design requirements are satisfied.