  Time-resolved polarizations carry more physical information about the source
of gamma-ray bursts (GRBs) than the time-integrated ones. Therefore, they give
more strict constrains on the models of GRB prompt phase. Both time-resolved
and time-integrated polarizations are considered here. The model we use is the
synchrotron emission in a large-scale ordered aligned magnetic field.
Time-resolved polarizations of GRB prompt phase are derived with the
corresponding time-resolved energy spectra. We found the time-integrated PDs
calculated with two methods are similar. So it is convenient to estimate the
time-integrated PD by the time-integrated energy spectrum. Most of the
time-resolved PDs calculated in this paper will increase with time. The trend
could match the observed time-resolved PD curve of GRB 170114A, but contrary to
the predictions of a decaying PD of both the magnetized internal shock and
magnetic reconnection models. PAs calculated in this paper, in general, are
roughly constants with time. The predicted PAs here can not match with the
violent PA changes observed in GRB 100826A and GRB 170114A. Therefore, more
accurate time-resolved polarization observations are needed to test models and
to diagnose the true physical process of GRB prompt phase.
