Magnetically Coupled Resonant Wireless Power Transmission (MCR-WPT) has advantages of large transmission power, moderate distance, and high transmission efficiency, etc. Given that the frequency resource division in MCR-WPT has not been unified, this paper is based on the WPT system of a two-coil Series-Series (SS) model. It analyzes the operating characteristics of a WPT system using a circuit model, and proposes the distance principle of WPT resonance frequency range division, so that different transmission distance ranges correspond to different resonance frequency sequences. It combines with an improved geometric mean principle to correct segmentation results, and the recommended values of the modified resonant frequency sequence are obtained. In order to enhance the adaptability of WPT to load changes, the resonant frequency point is expanded into the working frequency band, and a working frequency band determination method based on load characteristics is proposed. Then the resonant frequency sequence is combined with the working frequency band to complete the frequency band division of the MCR-WPT system based on the SS type. Finally, an experimental platform is built to verify the rationality of the frequency band segmentation results. This work is supported by National Natural Science Foundation of China (No. 51877017).