Abstract: This paper introduced SAC electrodraulic control system’s whole structure,main functions and key components related with following coal-cutter automation technology.On the basis of this,principle and realization method of following coal-cutter automation technology were present.It mainly introduced classification of this technology,recycling procedure of following coal-cutter,method of bidirectional coal cutting and automatic shifting powered supports,especially coal cutting technique in middle of face and face corners.Finally,it concluded the problems of this technology in actual mining and indicated key and urgent technologies in future.