Gear-tooth profile modifications and gear-tooth crowning do not change the geometric dimensions of the gear smoothness and can distribute the contact stress throughout the tooth surface and improve the reliability and capacity of the gear transmission, the smoothness of transmission thus it can reduce the effect of heat deformation after machining, resulting in a longer life span and decrease the vibration. Owing to the advantages of high efficiency, high precision, and environmental consciousness, etc., the electrochemical gear-tooth profile modification (ECGTPM) will become a valuable new technique. The focus is laid on developing an automatic control system for ECGTPM in this paper. The control architecture, the processing mechanism, the main components and their functionalities are demonstrated in detail. The implementation of the control system for ECGTPM is helpful to the improvement of productivity, safety, automation, etc.. Some experiments are verified to the advantages of this new technique.