Under the circumstances of axial symmetric and non-static current distribution, a method for calculating off-axis electromagnetic field is given by using Maxwells equations and axial symmetry.

在轴对称非静态电流分布的情况下，利用麦克斯韦方程组和轴对称性，给出了轴外电磁场的一种计算方法。

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By reproducing of the off-axis hologram the three-dimensional image of the particle field can be clearly seen.

再现离轴全息图可清楚地看到粒子场的三维图象。

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