本文对频率域无限长线源近区（过渡区）测深的理论基础进行了探索性研究。
The preliminary research result of electromagnetic prospecting with the near field(transition region) of infinite-length line source in frequency domain is presented in this paper.
将无限长线电荷看成二维平面上的一个“源”，利用电势叠加原理计算了无限长柱形均匀分布的电荷产生的电势。
The electric potentials given rise by the charges even distributed in space of pillar regions are calculated by means of the superposition principle of electric potentials.
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