Based on reverberation method,the viscous absorptions of 0.2-2.0kg/m~3 sediment and glass bead turbid seawater were measured.It is shown that the measurement results were more consistent with the prediction results using particle size distributions techniques instead of using average particle radius techniques.By comparison of the prediction results using particle size distributions techniques with that using average particle radius techniques,it was observed that the discrepancy is 2.3-2.6 dB every 100 meters for 1.0 kg/m~3 of sediment turbid seawater within the scope of experimental frequency.It was suggested that the particle size distributions should be considered in the predictions of viscous absorption in coastal turbid waters. Based on reverberation method, the viscous absorptions of 0.2-2.0 kg / m ~ 3 sediment and glass bead turbid seawater were measured. It is shown the the measurement results were more consistent with the prediction results using particle size distributions techniques instead of using average particle radius techniques.By comparison of the prediction results using particle size distributions techniques with that using average particle radius techniques, it was observed that the discrepancy is 2.3-2.6 dB every 100 meters for 1.0 kg / m ~ 3 of sediment turbid seawater within the scope of experimental frequency. It was suggested that the particle size distributions should be considered in the predictions of viscous absorption in coastal turbid waters.