Binary Offset Carrier(BOC) modulation is the main feature in the signals of modernized Global Navigation Satellite System(GNSS)，and it provides users with services of higher performance while introducing risks of false locks due to the multi-side peaks of the correlation function，to the procedure of tracking. A design of tracking method is proposed targeting at BOC(1,1) signals, in order to reduce the risks of false locks and achieve a high accuracy of tracking simultaneously by implementing a sideband tracking to aid a BOC tracking loop. A simplified version of structure and corresponding improvements are designed. The proposed method and design are verified to be able to track signals accurately without blurring.