  We conduct a comprehensive analysis of the accreting X-ray pulsar, Hercules
X-1, utilizing data from IXPE and NuSTAR. IXPE performed five observations of
Her X-1, consisting of three in the Main-on state and two in the Short-on
state. Our time-resolved analysis uncovers the linear correlations between the
flux and polarization degree as well as the pulse fraction and polarization
degree. Geometry parameters are rigorously constrained by fitting the
phase-resolved modulations of Cyclotron Resonance Scattering Feature and
polarization angle with a simple dipole model and Rotating Vector Model
respectively, yielding roughly consistent results. The changes of $\chi_{\rm
p}$ (the position angle of the pulsar's spin axis on the plane of the sky)
between different Main-on observations suggest the possible forced precession
of the neutron star crust. Furthermore, a linear association between the energy
of Cyclotron Resonance Scattering Feature and polarization angle implies the
prevalence of a dominant dipole magnetic field, and their phase-resolved
modulations likely arise from viewing angle effects.
