Abstract: In recent years，with increasing depth of coal mining，deep coal seam groups are gradually becoming the main producing seam in various coal mines.Differing from the single seam mining，more and more mining joint of coal seams are adopted due to low thickness in parts of coal seam and small space among each seam.Through the theoretical analysis on the test results of the ventilation resistance parameters under mining conditions of close distance coal seams in a mine，it is found that serious leakage phenomenon exists in the place between the airway and the upper closed work face.The numerical analysis on strata behavior regularity of close distance coal seams under the geological conditions indicates that the damage zones caused by the stress of close coal seams mainly concentrate near the end of roadway.The presence of the damage zone inevitably cause leakage phenomenon.The numerical analysis result conforms to that of the field test.Through the analysis on failure law of surrounding rock，that the problems appearing in mining of close distance coal seam is found out，provides a reliable reference for safe production of mines with similar geological conditions. Close-up|Ventilation resistance|Numerical analysis|Damage of surrounding rock