Abstract: The resistivity of soil is an important parameter to describe its electrical conductivity. Through in-situ testing of resistivity and laboratory tests, the characteristics of resistivity of clayey soil and the relationship between resistivity and geotechnical parameters were studied.22 logs of resistivity were measured in the first-stage terrace of Wuhan district. All these logs were placed along the traces of the No.7metro of Wuhan. Routine soil test, non-confined compression test, quick shear test and triaxial shear test were done by using samples taken from these logs. It was found that, firstly, the resistivity of clayey soil increased with the increase of water content and void ratio; secondly, the resistivity decreased with the increase of non-confined compressive strength; thirdly; according to the result of triaxial shear test, the resistivity decreased with the increase of cohesion and angle of internal friction. Through linear and polynomial fit, the mathematic expression between resistivity and geotechnical parameters of clayey soil were offered. The correlation between the resistivity and those indexes are significant.