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Ballistic midcourse maneuverable targets bring huge challenge to early-warning detecting tasks. The incoming threats targets could be lost in detection range of sensors and early-warning detecting tasks may be failure, which retard the response of a ballistic missile defense system and the criticality of missiles would be increased. How can the Space-based early warning system detect and track the ballistic midcourse maneuverable targets in real-time is a new issue. In this paper, a early-warning detecting tasks re-scheduling and sensor resources allocation strategy based on multi-levels is designed, sensor resources allocation rapidly come true and satisfied the dynamics and real-time tracking requirements of detecting tasks, as well as the fewer adjusting amplitude to originally resources scheme. Finally, taking the space-based early-warning detecting task of maneuverable ballistic missile for example, by which the feasibility and efficiency of the strategy are explained and proved.