在多层结构复合材料获得广泛应用的今天 ,对其分层结构、密度分布等情况的检测和了解显得尤为重要。在用射线对这类材料进行分层成像检测时 ,一直存在重建图像质量与重建效率(耗时 )的矛盾。本文提出了有限角度摆动式分层成像方法 ,并且通过计算机仿真计算证明了其合理性和高效率 ,在此基础上提出了最佳投影角度的选择原则 ,最后给出了应用实例。 In the multi-layer structure of composite materials are widely used today, its hierarchical structure, density distribution and other conditions of the detection and understanding is particularly important. There is always a conflict between reconstructing image quality and reconstruction efficiency (time-consuming) when using ray to detect such material in layered imaging. In this paper, the finite angle swinging layered imaging method is proposed, and its rationality and high efficiency are proved by the computer simulation. Based on this, the principle of selecting the best projection angle is put forward. Finally, some application examples are given.