Abstract: The compact BF-BOF interface mode which is "BF-the hot metal bottle-BOF" (direct charg-ing from the hot metal bottle into the converter) was put forward by analyzing the actuality of supplying hot metal in the steelworks. Its advantages were evaluated and analyzed on from time, the quality of hot metal, en-ergy resource and environmental protection, equipments and staff. The result showed that the exiting hot metal bottles must be changed, and two methods of the capacity-expansion of hot metal ladles were produced in light of the request of hot metal direct charging, and two methods' effects were compared. Finally, the change of correla-tive establishment was also discussed, and some reason were preposed for rebuilding the supplier methods in the steelworks.