The impulse of irregularly shaped space debris under laser irradiation was calculated, on the basis of the experimental phenomenon that reverse jetting under laser ablation is always normal to the irradiated surface no matter what the laser incident direction is. Fragments of sphere, cylinder and cube were selected as examples according to NASA's investigation of space debris's shape. The results indicate that for fragments o?sphere and cube shapes, the impulse direction was along The laser irradiation direction, and their magnitudes of impulse are fixed proportional to cylindrical one's when the fragments'materials were the same. For sylindrical fragments, both of the magnitude and direction of impulse change with the variation of laser irradiation direction.%研究了不规则空间碎片受激光辐照后的冲量变化.利用不论激光入射方向如何,烧蚀反喷方向始终沿着烧蚀平面法向方向这个实验现象,同时,根据NASA对于空间碎片形状的基本划分,分别计算了球体、柱形体和立方体受激光辐照后的冲量变化情况.计算结果表明:对于球体和立方体,无论激光辐照方向如何变化,冲量方向总是和辐照方向相同,冲量大小和垂直辐照相同材料的平板分别成固定比例关系；而对于柱形体,冲量大小和方向随着激光辐照方向变化而变化.
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