In the present work, the electrical conductivity of yellow brown earth, brown earth, black soil and latosol suspensions in 10^-4mol/L HCl or 5×10^-5mol/L H₂S0₄ or 10^-4 mol/L H₃P0₄ was measured with an apparatus with adjustable frequency.The results indicated that all the soil suspensions showed a conductivity dispersion phenomenon in all the acids.On all the conductivity-frequency curves a plateau region with a larger range of frequency appeared.