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Due to the effects such as mode coupling, bending, mode dispersion, etc, a speckle pattern is generated by passing a coherent laser beam through a multimode fiber. For a non-polarization-maintaining multimode fiber, the randomization also occurs in the polarization distribution. Feedback-based wavefront shaping has been applied in modulating the speckle generated by a scattering medium. Based on the feedback-based wavefront shaping, we propose the combination method to modulate the normalized polarization ratio (NPR) of a focal spot in the speckle field formed by non-polarization-maintaining multimode fiber. The quantitative control of the NPR is achieved by amplitude modulation or phase modulation. [ABSTRACT FROM AUTHOR]