Abstract: The 8212 working face in No.12 coal seam of Jinhuagong coal mine is mining overall height in one time working face.Aiming at the problems of large size of transport equipment,thick seam,difficulty of stop mining support,occupancy of long time,safe and fast stop mining on working face is achieved by pre-excavating stop mining machine road,shortening the time of stop mining support,which creates a considerable economic benefits.