运用传播圆-变换圆图解分析方法,在轴移不变性的基础上发展并理论推导了轴移→旋转→轴移变换的关系,丰富了轴移不变性的内容。通过传播圆-变换圆图解分析,指出五镜腔为非对称腔；并根据轴移不变性的轴移→旋转→轴移变换原理,提出了将其谐振腔改进为近对称腔的设计方案,从而使其性能更加优越,运转更加稳定。

Using the propagation-circle and transform-circle graphic analysis, relation of axial-transfer to rotation, and then to axial-transfer has been developed and theoretically deduced based on axial-transfer invariability, which enriched the content of axial-transfer invariability. It was pointed out that the five-mirror cavity was a asymmetric cavity. And the design-scheme of modifying the five-mirror cavity to a nearly symmetrical cavity has been put forward based on axial-transfer to rotation to axial-transfer transform. As a result, the operation performance of the modified cavity was more stable.