A novel templateless AC electrochemical deposition method for controllable synthesis of gold nano/micro wire was proposed. Liner gold nanowires could be obtained by controlling the processing parameters, such as AC frequency, plating solution concentration, etc. Gold wire fabricated by this method could connect the electrodes using oscillograph to monitor the circuit. The TEM characterization results prove the fabricated gold nano/micro wire is of single-crystal structure. The measurement results of the electrical characteristics demonstrate that the gold nano/micro wire has a low resistivity (7.8×10-7 Ω·m). The wire produced by the templateless AC electrochemical deposition method has the application potentials in micro/nano interconnection, bio/chemical sensors etc.