Abstract: It is clarified that the important method to improve the blast temperature from 1000 ℃ to 1 250-1 300℃ is to preheat both auxiliary air and coal gas. The blast furnace temperature can be reached to 1250-1 300℃ by burning single blast stove gas if using high speed burners and a type of external-combustion swirl-flowing hot blast stove to preheat auxiliary combustion air. The calculating results, similar to those determinating experimental data in a middle experiment hot blast stove, proved that there is no eccentric flow in the face of the store energy balls and the flow and temperature fields even.