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The special bistatic space based radar (BiSBR) system, which is composed of an illuminator on a geostationary satellite and a receiver on an airship, can be operated for area surveillance. It is anticipant for the realization of detection and tracking capabilities to moving targets that the high signal-to-noise ratio (SNR) is distributed uniformly in the theater area. In this paper, based on three coverage manners of transmitted beam for the theater area, an optimal transmitted beam design is proposed by comparison with the others. It is shown that the receiverpsilas elevation subbeams coverage in sequence according to different residence times is the optimal transmitted beam design for the special satellite-airship BiSBR system. The overall high SNR can be distributed uniformly in the theater area for the optimal transmitted beam design. The simulation results prove the validity of the conclusion.