Abstract: Coal Mining in loess hilly area,often can cause secondary disasters,collapse,landslide,based on the practice in the loess slope top coal storage bunker protective coal pillar set as an example,according to the coal storage area of terrain features,coal mining conditions,comparison,analysis on slope surface characteristics effects of coal mining,the protection method of storage bunker security coal pillar and pillar slope slip,slip the size of coal pillar is determined by the mining influence mobile angle method,mining practice proved by the slope body not produce landslides and storage bunker maintaining safe and normal use,the method of slope slip of the coal pillar is effective.