Abstract: Drop,stacking and blocking of the oxide skin always happen in the tube interior wall of thermal power plant heating surface. The resulting over heating and tube rupture attracts a lot of attention in the electric industry.RT technology in the detection of oxide skin stacking can be used in the boiler end superheater during boiler overhaul repair and it would be the most effective approaches and methods to prevent the same accidents. In this way, the condition of the drop and stacking of the oxide skin was detected accurately and corresponding measures could be drawn up timely.