  Averaged jet charge characterizes the electric charge for the initiating
parton, and provides a powerfull tool to distinguish quark jets from gluon
jets. In this paper, we give the first prediction for the medium modification
of averaged jet charge in heavy-ion collision at the LHC, where jet productions
in p+p collisions are simulated by PYTHIA6, and parton energy loss in QGP are
calculated with two Monte Carlo models of jet quenching: PYQUEN and JEWEL. We
found that the distribution of averaged jet charge is significantly suppressed
by initial state isospin effects due to the participants of neutrons with zero
electric charge during nuclear collisions. Considerable enhancement of averaged
jet charge in central Pb+Pb collisions relative to peripheral collisions is
observed, since jet quenching effect is more pronounced in central collisions.
Distinct feature of averaged jet charge between quark and gluon jets, together
with the sensitivity of medium modifications on jet charge to flavor dependence
of parton energy loss, could be very useful to discriminate the energy loss
pattern between quark and gluon jets in heavy-ion collisions.
