For seeking an inexpensive supersonic target at high altitude, tactical and technical data was studied. A big-caliber supersonic rocket was adopted for refitting finally. A mathematical model meeting tactic-technical specifications was established. In this model, burnout velocity and burnout trajectory tilt angle were set as the design variables, and effective target horizontal distance was set as the target function, powered phase parameter could be inferred subsequently. After simulation, the method was proved to be feasible, can reduce experimental cost greatly.