At present, acoustic monitoring technology has been incorporated into a number of protocols and specifications of different industries, and the development of this technology is becoming more and more mature. However, the development of acoustic monitoring applied to mining engineering is relatively backward, still in the stage of experimental research, with fewer research results and instrumentation equipment. Strictly speaking, acoustic monitoring technology is divided into two aspects of the background technology: ① coal and rock body due to force or other conditions change the role of the rock body itself produces or releases acoustic emission signals and acoustic monitoring and research activities, such as roof to pressure, coal and rock body deformation of the perimeter rock, the coal seam power impact effect phenomena, usually referred to as the rock acoustic emission monitoring, this type of monitoring with the nature of the rock body disaster prediction and forecasting purpose;②in the detection of research for the purpose of acoustic monitoring, coal rock body due to geological formation and crustal changes, human factors and other reasons for the formation of various types of tectonic zones, cavities, groundwater, high-temperature points(zones),abnormal rock stratum lithology and defects, etc. Detection of activities, which usually need to follow the characteristics of the acoustic emission of sound waves to the area to be measured to the one side of a specific frequency of the sound waves(most of them are ultrasonic)or multi-frequency sound waves, and receive sound waves in the direction of the other side of the sound waves, and the sound waves in the direction of the other side, and the sound waves received. The acoustic signal is received on the other side. For example, monitoring activities such as geo-radar, elastic wave CT, ultrasonic monitoring, etc. All belong to the category of acoustic wave detection (or monitoring) technology activities.