On ±660kV Ningdong-Shandong DC power transmission demonstration project general line, it uses JL/G3A-1000/45 large section ACSR and installs dampers to reduce aeolian vibration. According to the characteristics of the project and the conductor, the vibration frequency of 5Hz～45Hz shall be prevented with the damper for JL/G3A-1000/45. The author designed reasonable damper head through massive calculations and selected stranded galvanized steel wires that are suitable to the head, in order to make the measured resonance frequency dovetail into the theoretical calculated value basically. Frequency 1 of FDY-8 type damper is about 8.5Hz, while frequency 2 is 36Hz, and when the energy consumption is high, it may realize large protection span for JL/G3A-1000/45.