In the wireless communication system, the mobile station (MS) needs to synchronize with the frequency of the base station (BS), so automatic frequency control (AFC) is mandatory in the MS receiver. Usually the AFC adjusts the local oscillator according to the frequency offset estimation (FOE) results directly. But there will be large error of the FOE results in some extremely critical channel conditions, and these errors may lead the local oscillator drifting away. This invention aims to make the AFC loop more stable in bad channel conditions.