Yunjialing Coal Mine planed to adoptthe mining technology that preset packing body withhigh water content materials in roadway without coal pillars.In order to master the stability and theroof movement rule,we adopted the method of field measurement to monitor the stress and the stability of the pack wall at 12802 working face in Yunjialing Coal Mine through the monitor;we masteredthe character about the pack wall.The results showed that the stress gradually stabilizedwith the packwall away from the work surface and steady stress was less than the original rock stress,roadside location choice was reasonable and stress state was good;it was conducive to maintainthe integrity andstability of the filline body.This conclusion can provide a basis for the reasonable supporting designand the recovery of the coal safety of next working place.