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Demagnetization behavior of Halbach magnetized compensated pulsed alternator (CPA) is studied by using finite element method (FEM) under the different demagnetization factors in this paper. The effect of armature reaction magnetic field and thermal rise on demagnetization of PMs is analyzed. This paper investigates the effect of different demagnetization factors on magnetic field distribution, load current, and no-load phase voltage. A series of dynamic demagnetization points in Halbach array permanent magnet (PM) are evaluated to search the worst working point. Partial demagnetization risk can be represented by the worst working point, and the global demagnetization of the PM is represented by the no-load phase voltage characteristics after discharge. The research results demonstrated that the compensation shield with a certain thickness can increase the discharge current and weaken the demagnetization influence of armature reaction. The demagnetization effect of armature reaction on PMs at high temperatures will be strengthened.