The layout principle of charging position is that the front is light and the rear is tight, which must be beneficial to the furnace hearth. To this end, we must first determine the loading position of the first batch of materials, generally at the waist or lower part of the furnace body, and the small blast furnace is higher. The proportion of net coke and empty coke added below the first batch of normal materials to the total net coke and empty coke varies with the charging method of the furnace. When the furnace is filled by standing wood method or filling wood method, the net coke and empty coke below the first batch of normal materials account for about 65% of the total net coke and empty coke; 1/2 or 1/3 firewood filling method is about 75%; The coke filling rule requires more than 85%. In addition, limestone needs endothermic decomposition and slagging, so the position where limestone is added to the empty coke should not be too low, and it is generally appropriate to add it to the upper part of the furnace belly or the lower part of the furnace waist. When different furnace charging methods are adopted, the proportion of net coke before empty coke accounts for more than 50%, 60% and 70% of the total net coke and empty coke respectively. Before the furnace is fully heated, it is necessary to minimize the flow of cold slag into the furnace to avoid freezing the furnace. The load of normal materials should be increased from top to bottom. The minimum normal charge is generally 0.5 ~ 1.0, and the charge range of each section can be larger, which is beneficial to the preheating and reduction of ore.