Abstract: With the development of mining industry，the mining area and depth have been increased in a single open pit．At the same time，deposit occurrence of ore and rock in mining limits become complex and changeable，which makes combined mining system has wider application．This paper put forward to analyzing the concept of combined mining system，and brings up spatial match mode of each single system in the combined one，facade and planar match．Apart from that，the concepts of strict limited system and nonstrict limited system have been established．Basic features of strict and nonstrict limited systems are analyzed based on a case study of combined mining system dominated by dragline stripping system．Stability model of combined mining system including strict limited system has been established．Dynamic adjustment strategy of mining parameters in combined system has been proposed on the basis of strictly limited system service area．

Key words: dragline, combined mining system, match mode, limited system