Abstract: in order to further improve a backil oal mining eficiency and to ensure a consistency of thesolid backill qulty an automatic echmnology of the solid bac剎ill was provided and an automatic control system of the sold bacill as designed and developed. An automatie conrol tacics and mathod were provided,i ncludingthe mathematical relatonship between the thrust of the bac ll owered support and the dense backill rte,the bac.llfeeom afi ced tothe bac.ll mnig opertioand the space-time characteristics of the backill cal mining. The paper in detal analzed the automat c ackil oal mining and the mig ation la to contrlthe over:urden strata above roof of coal mining face. tMeanwihile,the automatic control procedue of the powered suppor in the system.the distrbuion and conirol principle of hsensors and the system control mode were realized in thesite industral aplications The resulis showed tht the backil fciency and pushing forward speed were both inproved about 4 %,the labor intensty and backil cost were highly reduced,the backil ffct was obvicusly improved and the scientific development ofthesolit beckfill coal mining was powerfully promoted.