A power matching system is applied to a central processing unit (CPU) power supply, which includes a power control chip to regulate the frequency of the signal applied to the CPU power supply. The power control chip includes a detecting pin. The power matching system includes a control unit and a control circuit. The control unit includes a platform controller hub (PCH) to obtain information concerning a CPU, a basic input output system (BIOS) to obtain a power rating of the CPU, and an integrated baseboard management controller (IBMC) to output a required signal to the control circuit according to the power rating established. The power control chip receives the required signal from the control circuit and regulates the frequency of the signal applied to the CPU power supply.