There is a great difference between the transient response characteristics and the power frequency response characteristics of the grounding device under lightning strike. Its grounding impedance decreases under the action of soil impulse characteristics. In this paper, a test platform for the frequency characteristics of soil electrical parameters is built, and the frequency characteristics of soil electrical parameters are tested based on the quadrupole method. The real part of the relative dielectric constant of the soil and the change rule of conductivity are obtained. Meanwhile, the accuracy of the test results is verified in this paper by using the frequency domain relationship between the conductivity and the real part of the dielectric constant. Combined with the AC steady state response and impulse transient response tests of the soil, the calculated voltage waveforms are in good agreement with the measured voltage waveforms. It also verifies the validity of the AC frequency characteristics of the soil's electrical parameters in the calculation of the impulse response. The results of the impact response tests and calculations of the sample soils show that the consideration of the frequency characteristics of the soil electrical parameters is crucial to the accuracy of the impact response calculation, which provides a reference for the calculation of the impact grounding impedance of the conductor.