  A high-degree of polarization of gamma-ray burst (GRB) prompt emission has
been confirmed in recent years. In this paper, we apply jitter radiation to
study the polarization feature of GRB prompt emission. In our framework,
relativistic electrons are accelerated by turbulent acceleration. Random and
small-scale magnetic fields are generated by turbulence. We further determine
that the polarization property of GRB prompt emission is governed by the
configuration of the random and small-scale magnetic fields. A two-dimensional
compressed slab, which contains stochastic magnetic fields, is applied in our
model. If the jitter condition is satisfied, the electron deflection angle in
the magnetic field is very small and the electron trajectory can be treated as
a straight line. A high-degree of polarization can be achieved when the angle
between the line of sight and the slab plane is small. Moreover, micro-emitters
with mini-jet structure are considered to be within a bulk GRB jet. The jet
"off-axis" effect is intensely sensitive to the observed polarization degree.
We discuss the depolarization effect on GRB prompt emission and afterglow. We
also speculate that the rapid variability of GRB prompt polarization may be
correlated with the stochastic variability of the turbulent dynamo or the
magnetic reconnection of plasmas.
