In the process of preparation,transportation and storage of pulverized coal,the accumulated pulverized coal is usually exposed to oxidation environment. When the external temperature is too high,it is very easy to spontaneous combustion. The low frequency sound wave has the characteristics of low attenuation and long propagation distance. The acoustic temperature measurement method using low frequency sound wave as sound source can effectively make up for the lag warning of conventional thermocouple and realize real-time measurement,and significantly improve the intelligent level of power generation process. The sound absorption characteristics of the accumulated pulverized coal and the propagation characteristics of low-frequency sound waves (frequency in 200-2 000 Hz) in the accumulated pulverized coal were mainly explored. Four kinds of coal samples with different particle sizes were prepared from the bituminous coal produced by Fuquan coal mine. The sound absorption characteristics of pulverized coal were mainly studied from two aspects of different particle sizes and stacking height. The results show that the sound absorption curve of stacked pulverized coal has multi-peak phenomenon;experiments on the propagation characteristics of low-frequency sound waves in accumulated pulverized coal at different frequencies were carried out. The results show that the acoustic attenuation coefficient has an obvious downward trend in the range of 1 000-2 000 Hz. The velocity measurement results show that the range of sound velocity is 142.261-142.851 m/s,and the standard deviation is about 0.1%. The results are more stable. The feasibility of acoustic measurement of temperature distribution of accumulated pulverized coal is verified.