Based on the map of terrain and appearance of China or the map of effective ground conductivity of China, which was developed by Shaanxi Astronomical Observatory, the paper submits a simple method to predict propagation delay of BPL signal.

• 本文提出了一种根据全国地形地貌图或陕西天文台绘制的全国等效大地电导率图作BPL时号传播时延预测的简便方法。