Abstract: In order to study the characteristics of rock sound single in the prediction of rock burst by means of rock sound monitoring technology，using theory of burst start-up，according to the different position of burst-up and burst display，the early warning signal of rock sound is divided into three types，Combined with the load of the force source，three types are refined，and the characteristics of the ground sound signal under the first type of concentrated dynamic load are studied，the characteristics of rock sound single of 450B3+6 working face in a mine of Xinjiang and No.47208 working face in a mine of Gansu were analyzed on the basis of the monitoring data of KJ623 rock sound monitoring system. The results show that，under the first type of early warning，when the energy and frequency of rock sound around a normal value，means that the working room is in a safe state; but when the numerical jump to an abnormal value (energy：about 20 000 /min，frequency：about 40 /min)，and last for a long time(generally greater than 8 h)，means that the working room is in a state of danger. The research can realize early warning for the burst of roof type,fault type and so on by rock sound monitoring system.