Abstract: According to a low backfill efficiency problem of the present comprehensive mechanized solid backfill coal mining, a backill automation system of the co mprehensive mechanized solid backfill coal mining was designed and developed. The paper introduced the comprehensive mechanized solid backfill coal mining techno logy and a general design plan of the backfill automation system was provided. The paper introduced the key technologies of the backfill automation system, including a collaborative operation procedure of the coal mining and backfill in the coal mining face, automatic backfill process behind the powered support, protection of the follow- up function to the automatic backfill system of the coal mining face, technology to avoid a collision between the pushing and compact mechanism and the multi borehole s bottom unloading type scraper conveyor, a coordinative synchronous control technology of the powered support pushing and backfill conveyor. The application results of the backfill automation system to Xingtai Mine showed that after the system applied, an average backfill time of a singe powered support was a half time of the previo us manual backfill time. Thus the backfill and coal mining efficiency could reach the fully mechanized coal mining efficiency and could improve the backfill automatic de gree.