By analyzing transmission pathway and mode of VLF radio wave, calculation formula of field intensity is given.

分析甚低频电磁波传播路径与方式，给出场强的计算公式。

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The signal will have attenuation and disturbance due to environmental factors in the process of VLF radio wave propagation, which will impact the reliability of submarine communication.

甚低频(VLF)电波传播过程中因环境因素影响会使信号产生衰减与扰动，导致潜艇收信可靠性下降。

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