PURPOSE: To easily execute blast furnace operation matching to the aimed operating condition by charging while adjusting mixed material of ore kind and coke kind when the layer thickness ratio of the ore kind and the coke kind at the furnace wall side exceeds the specific value at the time of executing in order layer charge of only the ore kind and layer charge of only the coke kind.

CONSTITUTION: A furnace top bunker 2a for the ore kind, furnace top bunker 2b for the coke kind and a furnace top bunker 2c for the mixed material of the ore kind and the coke kind are arranged so as to be possible to charge in the blast furnace 1 with a swing chute 4 through flow adjusting gates 3, respectively. By this constitution, the coke kind and the ore kind are charged into the blast furnace 1 in order layer by layer and the average layer thickness in the range of ≤ about 700mm from the wall side in the blast furnace is measured with the measuring instruments 5, 5a. When the ratio (Lo/Lc) of the ore layer thickness (Lc) and the coke layer thickness (Lc) exceeds 1.20, the charging quantity and charging position of the mixed material of the ore kind and the coke kind are adjusted and charged in accordance with the layer thickness ratio. By this method, the stable and good blast furnace operation is executed.