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Rapid processing of star image is important guarantee for the precise attitude determination of agile satellite. And star centroid distillation is the precondition of the stellar map identification. The generation mechanism of motion-blurred image in star sensor is given. The degradation model of motion blurred star image is built up. In addition, Wiener filter with optimal window technique is adopted to deal with the motion-blurred images and its performance in restoration of image is discussed in this paper. The simulation results show that with this optimal window, the edge error is restrained or reduced and the blur star image is restored effectively, which is the base of star centroid and stellar map identification.