本文首先讨论了强化垂直聚焦测深法(简称聚焦测深法)的视电阻宰表达式,提出了在实际工作中代换该法的简单装置及其观测方案。其次,详细分析了利用线性滤波法计算的聚焦测深法ρs理论曲线,指出了似增层性质及多种因素对ρs曲线的形状和特征点极距的影响作用。最后阐明了聚焦测深法在地质效能上不具有定勘探深度的原因。 In this paper, we first discuss the apparent resistance slagging expression of intensified vertical focus-sounding method (referred to as focusing sounding method), and put forward a simple device replacing the method in actual work and its observation scheme. Secondly, the ρs theoretical curve of focal depth sounding method calculated by the linear filtering method is analyzed in detail, and the influence of the layer buildup property and many factors on the shape of the ρs curve and the pole pitch of the feature point are pointed out. Finally, the reasons that the depth of focus sounding method does not have the depth of geophysical prospecting are clarified.