This paper proposes a novel magnetization state (MS) control method to eliminate the unintentional demagnetization (UD) of low-coercive force permanent magnet (PM) for variable flux memory motor (VFMM). In the proposed method, the dq-axis inductance properties under different MSs are analyzed. In the constant torque region, the maximum torque per ampere (MTPA) control is utilized to improve the torque performance. A PM flux linkage observer is adopted to detect the UD, and a look-up table for the relationship between the MS change intersections and demagnetization d-axis current pulse is established. The demagnetization d-axis current pulse is used as the condition for the MSs manipulation, and thus, the maximum flux weakening d-axis current under certain MS can be determined to avoid the UD in the whole speed range. The simulation on a hybrid magnet memory motor system is carried out to verify the feasibility of the proposed MS control method.