Abstract: in order to improve the calculation eficiency and accuracy of the mine microseism signal bvalue,based on the actual microseism event occurred during the mine heading period of Mengcun Mine as the sample, a study was conducted on the sample,parameter selection and other problems related to the b value calculation process. In the different seismic occurred area,the microseism e different,the selection of the b value calculation sample should be the seismic occurred area as the base unit and the seismic occurred scope should be determined with the related microseism event distribution of the inner all seismic unit. Due to lackof the low seismic event,thus the b value calculation results would be highly reduced.The best initial seismic grade could be determined with the analysis on the related coefficient varation tendency. When the high level seismic grade was set up.the frequency rate disribution condition of the high seismic grade of the sample should be considered and the microseism frequency and the theoretical value related to the highest grade were quite same. In order to ensure the pushing process of the time windows,the total umber of the neutral gear would not be changed. When the time window too short,the b value calculation results would be easily infuenced by the random abnormal factor. But when the time window was too long,due to early historical data infuence too high,the b value would be too low and the reparability on the time series would be poor.Related to he variation curve of the b value would be more stable and would have the sectional high(1ow) value zone. The prompt effect of the energy eventwould be better than the energy and frequency curves.