Abstract: The closed distance coal seam mining has large proportion in China，and recoverable mining coal reserves，which less than 10 m layer distance in Mugua mine of Lvliang，amounting to total reserves of 80%. So the rock microseismic study of under closed distance coal seam mining technology is of the important practical significance. The closed distance lower coal mining in Mugua mine，the technical problems were tunnel supporting of 109 working face and the reasonable width of coal pillar. Based on the microseismic monitoring theory，the in-situ monitoring method is used in the return airway strata break of time and space position，energy and microseismic distribution form characteristics with working face impelling，the 109 working face of mine pressure distribution rule and lateral strata break law and damage degree were determined. It provides scientific data with determining the reasonable coal pillar width，the closed distance of the coal resources realized safety and efficiency mining.

Key words: Close coal seam, Safety mining, Mine microseismic monitoring, Microseismic distribution form, Coal pillar