Abstract: Capacitance coupled resistivity (CCR) is an exploration technology with no contact with the ground, rapid detection and good exploration effect in areas with high grounding resistance (i.e. poor coupling). In this paper, the electrical characteristics of the method under the symmetrical dipole-dipole device are discussed. The numerical simulation of the transmission impedance curve under the combination of different parameters such as current frequency, relative permittivity, device coefficient and resistivity parameters shows that, when the current frequency is about 15 KHz, the trend of the impedance curve observed by CCR method is relatively stable. The observation results can be processed and interpreted directly by using the DC method processing technology and experience, and the accuracy of the numerical simulation results can be verified through the known road collapse area and unknown area of an urban trunk road.