基于分析和比较各种编码图形的二维二值位相光栅的优缺点.提出了一种设计任意图形编码的二值位相光栅的方法。该方法主要分为两步.首先以获得最高衍射效率为基准.寻求任意图形编码的二维二值位相光栅的初始结构.然后采用一种迭代算法优化初始结构获得期望的光强分布。设计了7个可等强分束的二维二值位相光栅，其衍射效率均大于80%，均匀性偏差均小于0.01%。

A method to design an arbitrary-geometty(0,π)model binary phase grating isproposed after we have analyzed and compared the characteristics of all kinds of codingschemes.The development of this method can be divided into two steps:firstly,to get thehighest diffraction efficiency,we find the initial binary phase structure,secondly,we adoptan iterative method to optimize above initial structure to get expected intensity dispersion.We have designed 7 binary phase gratings to split the incident light beam into equal-intensity beams. Their diffraction efficiencies are all above 80% and their uniformity deviations are all below 0.01%, which are better than other reported results to the best of our 1< knowledge.