Abstract: According to the log-normal size distribution of the sand particles, the calculation model of microwave attenuation induced by the charged sand is got based on the forward scattering amplitude function under the Rayleigh approximation and the effective permittivity method. The attenuation is simulated and analyzed. The attenuation evidently increases with the charged sand particles to microwave signal, the more charge collection on surface of the charged sand particles, the stronger influence to the attenuation of microwave. And the attenuation evidently decreases with the visibility of sand particles increasing. Generally for sand with the same water content, the change of attenuation is small while the electromagnetic wave frequency below 35 GHz, the influence is obvious while the freque