In wireless power transfer systems, the system is prone to frequency splitting phenomena under the over-coupling and low load resistance conditions. The frequency splitting affects the system power transmission, the transmitted power exhibits a minimum value at the resonant frequency, while the maximum values occur on both sides of the resonant frequency. This paper proposes a method for avoiding the frequency splitting phenomenon based on variable inductors at a fixed frequency. Employing SS topology compensation, variable inductors are serially connected to the primary and secondary sides, and the inductance values are controlled by DC bias current. An equivalent mutual inductance model is used to analyze the impact of driving frequency and variable inductance variations on important parameters such as input impedance and system gains. The MATLAB simulation platform is established to verify the effectiveness of the method, and the experimental results show that the proposed method can improve the system output power under frequency splitting conditions.