In order to produce asynchronous starting torque for electric function, the rotor is also provided with cage cast aluminum winding. The rotor is provided with a reaction groove corresponding to the number of stator poles (only the action of the salient pole, no excitation winding and permanent magnet) to generate the magnetoresistance synchronous torque. According to the structure of the reaction tank on the rotor, it can be divided into internal reactive rotor, external reactive rotor and internal and external reactive rotor. Among them, the reaction tank of external reactive rotor opens the outer circle of the ground rotor, making the air gap between the vertical axis and the quadrature axis. The internal reaction rotor has internal grooves, so that the quadrature axis direction of magnetic flux blocked and increased reluctance. The internal and external reactive rotor combined with the structural features of the two rotors. The vertical axis and the quadrature axis are different greatly, which makes the motor's force energy larger. The magnetoresistive synchronous motor can be divided into single-phase capacitor running type, single-phase capacitor starting type, single-phase double-value capacitor type and so on.