A method for manufacturing a radiating module consisting of a plurality of radiating fins, at least one heat-transfer tube, and a seat includes the steps of forming through holes on the radiating fins, extending the heat-transfer tube through the through holes on the radiating fins, and positioning a seat in an open-bottomed recess formed at a lower surface of the radiating fins to connect to the heat-transfer tube. The seat is made of the same material as the heat-transfer tube, so that heat energy can be quickly transferred from the seat to the heat-transfer tube and radiated from the radiating fins without the need of contacting of the seat with the radiating fins.