The effect of dust particles on the attenuation characteristic of plasma is discussed in three kinds of situation: 1) considering the collision between particles only; 2) considering both the particles’collision and the charging of the charged particles (electrons and ions) on the dust particle; 3) considering the effect of the electrical potential based on 2). Based on the calculation of the attenuation coefficient, the rocket exhaust plume is taken as an example on further analysis and discussion. The attenuation coefficient has a critical value with temperature and pressure, when in the low frequency of microwave band, and the corresponding attenuation coefficient produces a trough. The attenuation peaks appears near the dusty plasma resonant frequency. The distance between the position of the peak value and the resonant frequency is determined by the effect of the temperature and pressure on resonance frequency. At a given temperature, pressure and frequency, the attenuation coefficient of the third is larger than the other two and in the area of the experimental data. So, the effect of the electrical potential impact factor needs to be considered in the calculation.