Abstract: In order to analyze whether the landfill-leachate contaminated soil area and leachate content can be detected quantitatively with electrical resistivity method or not, the resistivity of saturated sand soils polluted by landfill-leachate in lab is measured with 2D or 3D resistivity tomography method and electrical probe. The measured results show that the contaminated area in soil layer has a low-resistivity abnormal character, the boundary of abnormal area in resistivity section corresponds to that of contaminated area, and it varies with landfill-leachate diffusing. The measured resistivity of contaminated sand soil with electrical probe has a quantitative relation with leachate content, and the leachate content can be calculated with the Archie type formula from the measured resistivity. A case study shows that the relative error of the calculated landfill leachate content to the true content is less than 10%. But two experiments are necessary in the process of calculating landfill leachate content with measured resistivity one is the resistivity test experiment of landfill leachate while being diluted, the other is the resistivity test experiment of different saturated sand soil samples.