Abstract: Currently more coal resource is buried in deep and more high-quality resource is located in the west of Chi- na. It makes a deep mining and a mining in the west become the new normal of coal resources exploitation. Thus a green mine construction,green mining development and green mining propulsion are imperative. This paper puts for- ward a “ mining-dressing-backfilling +X” technical conception of green mining of coal resources. That is an under- ground integrated production system,which is integrated coal mining, coal-waste separation, and gangue backfilling with “active control of strata movement,gob-side entry retaining,gas extraction,disaster prevention,water-preserved- mining”. The system forms a coal mining-dressing-backfilling+X(control,retain,extraction,prevention and preserved) collaborative production mode. The paper defines the “ mining-dressing-backfilling + X ” technical connotation and framework of green mining,expounds “mining-dressing-backfilling+X” evolution of four generations,analyzes the spe- cific technical advantages of its practice of green mining and gives the scientific engineering design method. The paper elaborates five aspects of typical “mining-dressing-backfilling+X” technology corresponding technical principle,engi- neering requirements,design process and methods,key technology and process equipment. Engineering practice of the Tangshan Coal mine,Zhaizhen Coal mine and 12th Coal mine of Pingdingshan Group has respectively proved that “mining-dressing-backfilling + control”, “ mining-dressing-backfilling + retain”, “ mining-dressing-backfilling + extrac- tion” technologies have a remarkable technical superiority and the engineering demonstration effect. “Mining-dressing- backfilling+X” green mining extension in the future combines “ mining-dressing-backfilling + processing”,“ mining- dressing-backfilling+intelligent”,“mining-dressing-backfilling+adjustment” and “ mining-dressing-backfilling+coordi- nation”. The overall formation of the “mining-dressing-backfilling+X” technology system can provide a strong techni- cal support for the realization of green mining of coal and associated resources.