The performance of mine fans directly influences the production safety of the coal mine. In order to maintain the same speed of the two rotors of contra-rotating dual-rotor permanent magnet synchronous motor（CDPMSM）, the dualrotor synchronization technology of the CDPMSM for the counter-rotating fan is studied. Through the special permanent magnet material selection and the dual-rotor size matching method, the synchronization of the two rotors in steady state is ensured. The characteristics of the stator coupling magnetic field are analyzed. The model of equivalent magnetic network based on parallel magnetic circuit is established by introducing stator core normal direction reluctance and tangential direction reluctance. A deviation coupling control system is established to ensure the dynamic synchronization capability of the two rotors. The research results show that the CDPMSM can maintain good speed synchronization ability under asymmetric load.