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本文根据等效电磁流方法的概念，导出了求解物理光学场、边缘绕射场和总场的等效电磁流的一般表达式，它们可退化到目前已存在的各种等效电磁流公式；并提出了一种最佳的计算物理光学场的等效电磁流公式．根据半平面非均匀性电流的精确表达式，导出了一阶、二阶和三阶等效边缘电磁流的表达式．最后用本文导出的公式计算了菱形板的双站散射截面，计算结果和实验结果吻合良好。
Based on the concept of equivalent electromagnetic flow method, this paper derives the general expressions of the equivalent electromagnetic currents for the physical optical field, the edge diffraction field and the total field, which can degenerate into the existing equivalent electromagnetic flow equations. And proposes an optimal formula for calculating the equivalent electromagnetic flow in a physical optical field. According to the exact expression of half-plane nonuniform current, the expressions of first-, second- and third-order equivalent edge electromagnetic currents are derived. In the end, the double-station scattering cross-section of the diamond plate is calculated by the formula derived in this paper. The calculated results are in good agreement with the experimental results.