用Ｆｏｘ－Ｌｉ迭代原理计算了含位相片谐振腔的模式，计算表明用惠更斯－菲涅尔衍射原理能很好地解释含位相片谐振腔输出新光束这一物理现象，而且改变位相片的厚度和半径，可能输出其它的新光束。还介绍了谐振腔输出新光束的二元光学设计方法，提出了强度恢复算法，并与Ｆｏｘ－Ｌｉ迭代方法进行了比较。 The mode of the cavity with phase photo was calculated by using the Fox-Li iteration principle. The calculation shows that the physical phenomenon of the new beam output by the cavity containing the photo-resonator can be well explained by the Huygens-Fresnel diffraction principle, The thickness and radius, it is possible to output other new beams. The binary optical design method of a new beam output from a resonant cavity is also introduced. An intensity recovery algorithm is proposed and compared with the Fox-Li iterative method.