To evaluate a stress effect to the ferromagnetic properties, this paper proposes a methodology utilizing a frequency response of the domain based magnetization model. A key idea of this approach is based on the following facts that the parameters identification of a domain based magnetization model has been successfully developed by a harmonic balance approach. Since the parameters of the model are extremely sensitive to the various measurement conditions such as temperature, mechanical stress and so on, investigation to the model parameter deflection while controlling a particular measurement condition reveals its controlled parameter effect to the tested ferromagnetic materials. As a result, it is found that the stress effect to a parameter expressing hysteretic property has been clearly deflected its values depending on the externally applied stresses.