Abstract: Abandoned for a long term，the shaft heads of small coal mines are stuffed and buried by industrial waste and construction wastes，so it is difficult to find the exact location of the mine shaft.If not plugged and backfilled efficiently，walls of the pit will be damaged by the dynamic load or earthquake.Especially when the inner side of the drift bed is damaged，the quick sand will flow and burst into the mine，which would cause surface deformation resulted from scouring ground around the shaft.Thus，the hidden safety risks may emerge for the passerby and buildings around.By analyzing the physical character of the long-term abandoned small coal pit，the idea for shaft detection and plugging technique of the buried pit are proposed.

Key words: Buried shaft, Detection technology, S-haft plugging