  We propose to extract the charge information of high energy muons in very
inclined extensive air showers by analyzing their relative lateral positions in
the shower transverse plane. We calculate the muon lateral deviation under the
geomagnetic field and compare it to dispersive deviations from other causes. By
our criterion of resolvability, positive and negative muons with energies above
$10^4$ GeV will be clearly separated into two lobes if the shower zenith angle
is larger than $70^\circ$. Thus we suggest a possible approach to measure the
$\mu^+ / \mu^-$ ratio for high energy muons.
