Various reasons caused wall thickening many times in No.1 blast furnace (the third generation ) of Baosteel after reaching yield, standard and efficiency. This affected the normal production of the blast furnace. We mainly adopted to develop the edge current of gas, to raise the temperature of iron water and to adjust the cooling method after BF wall thickening. This text would introduce the omens, reasons and the processing method of BF wall thickening in blast furnace No.1 (the third generation ) of Baosteel.