The true anomaly of underground object is concealed in the observation results of high-density electrical prospec-ting due to the topographic false anomaly. In order to make the exploration results closer to the actual geological conditions, the correction for topographic influence should be carried out. At present, the influence of topographic relief is ignored in the common methods, thus the actual positions on the sounding point needed to be corrected. The orthogonal projection method is applied in practical high-density electrical prospecting to conduct the topographic correction, which means correcting the position and elec-trical resistivity value of every sounding point by the calculation of trigonometric orthogonal projection. The orthogonal projection method has a good result in the actual projects by remedying some deficiencies of previous topographic correction method. To a-chieve better inversion results, diversified factors of topographic effects and a comprehensive topographic correction method should be considered and applied.%高密度电法勘探中常因地形起伏使观测结果产生畸变，虚假异常掩盖了地下目标体的真实异常，为使勘探成果更接近实际地质情况，必须进行地形影响校正。目前，普遍采用的地形校正方法均忽略了地形起伏的影响，因而需要对测深点的实际位置进行校正。在实际工作中采用正交投影法进行高密度电法地形改正，即采用三角函数正交投影计算的方法，对每一测深点的位置及电阻率值进行校正。该方法弥补了以往地形校正方法的不足，在实际工程运用中效果较佳。但要取得更好的反演结果，还必须考虑地形影响的多种因素，采取综合的地形影响校正方法。
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