Karst collapsed columns are widely developed in Qinshui basin，which has great influence on formation and distribution of gas accumulation. In order to analyze its influence on gas accumulation，by studying the column’s formation conditions，characteristics and distribution，it is found that the columns mainly formed during the time of Himalayan movement；they distribute in groups in the plane and most of them are half columns with a general diameter range of 100-300 m，cut through the upper main coal bed，namely the 3rd coal bed. Lots of broken belts and decompaction belts developed in the collapsed columns，which provide pathways for the gas accumulating in coal and sandstone to migrate outside. The seam pressure declines after the formed columns cut through the coal bed，which provides conditions for the coal seam gas desorption. The collapsed columns also communicate the seam vertically with the upper and the lower adjacent aquifers，which results in the hydrodynamic connectivity of different strata and the migration of desorbed gas into the upper stratum in free state or accompanying with underwater circulation. So the collapsed columns would play a role in destroying the gas accumulation in the coal measure strata，which leads to a low coal seam gas concentration around the columns and a decline methane concentration and an increasing concentration of N2，CO2. Additionally，several collapsed columns play a role in migrating seam gas into shallow strata to form new gas reservoirs. But most of the cases show that the areas influenced by the columns are always limited.