Wavy fibers fabricated by electrohydrodynamic jet printing (E-J-P) have been used in many applications, such as sensors, electromechanical systems, stretchable electronics products, and flexible displays. Auxiliary electrodes (A-E) were initially used to control the deposited morphology of the wavy fibers in this study. A polyethylene oxide solution was electrospun with an applied voltage of 1kV and an alternating current power (ACP) supplied to A-E. The experimental results show that the amplitude can be controlled by the voltage of the ACP, and the generated frequency of the wavy fiber is the same as the frequency of the ACP.