The goal of this paper is to put forward the origin dispersing gesture model of the rod in the discontinuous-rod warhead ignited at the center to be used for the engineering. According to the ground experiment result of the typical focusing discontinuous-rod warhead ignited at the center of the warhead, the infinitesimal element origin-velocity model of this typical focusing discontinuous-rod warhead is put forward. After then, based on the velocity model, the velocities at the both ends of rod are resolute and the flying distance model is introduced when the axis of the dispersed rod rotates to be perpendicular with the axis of the warhead. The calculating results are contrasted with the value from other ground experiment to validate the feasibility of the model in the engineering. The content in this paper is referred for the design of the focusing discontinuous-rod warhead ignited at the center.