  In addition to the light curve and energy spectrum, polarization is also
important for the study of Gamma-ray burst (GRB) prompt emission. Rotation of
the polarization angle (PA) with time will cause depolarization of the
time-integrated polarization degree. However, it is rarely studied before.
Here, we use the magnetic reconnection model with a large-scale ordered aligned
magnetic field in the emitting region to study the influence of the key
parameters on the PA rotations. We find that half-opening angle of the jet
$\theta_{j}$, the observational angle $\theta_{V}$, and the bulk Lorentz factor
$\Gamma$ all have significant impacts on the PA rotations. For a fixed
$\theta_{j}\Gamma_{0}$ value ($\Gamma_{0}$ is the normalization factor of
$\Gamma$), regardless of concrete $\theta_{j}$ and $\Gamma_{0}$ values, PA
rotation within $T_{90}$ ($\triangle$PA) remains roughly unchanged for a
$q\equiv\theta_{V}/\theta_{j}$ value. As $\theta_{j}\Gamma_{0}$ value
increases, the $q$ range for $\triangle$PA$>10^{\circ}$ becomes smaller. The
most significant PA rotation with $\triangle$PA$\thicksim90^{\circ}$ will
happen when $\theta_{j}\Gamma_{0}\thicksim100$ and $1.1\leq q\leq1.2$. For the
top-hat jet, observations of the PA rotation within $T_{90}$ will imply a
slightly off-axis observation.
