Rectifier circuits are used where DC voltage is needed. Diodes or thyristors are preferred in rectifier circuits. However, power factors of the rectifier circuits based on the current diode or thyristor are low and draws current components with high total harmonic distortion from the network. With the innovations in power electronics, the rectifier structures with high power factor have been used in many applications in recent years. In this study, Genetic Algorithm (GA) based PI controller is designed and DA-link voltage of the single-phase rectifier is controlled. Thus, the gain parameters of the PI controller are determined and applied to the DA-link voltage unit. A simulation model is developed in Matlab/Simulink to investigate the performance of the proposed controller structure.In addition, the proposed controller structure and PI controller are compared under the same conditions. According to the results obtained from the simulation studies, the GA-based PI controller structure has better performance than PI controller of the single-phase rectifier's DA-link voltage control.