  We report detailed study of the transport properties of FeSe$_{1-x}$S$_x$
($x$ = 0 and 0.14) single crystals grown by vapor transport method. 14\% S
doping is found significantly suppress the structural transition from $T_s$
$\sim$ 86 K in FeSe to $\sim$ 49 K, although the superconducting transition
temperature, $T_c$, is only slightly affected. A pronounced linear
magnetoresistance (MR) is observed in both FeSe and FeSe$_{0.86}$S$_{0.14}$
single crystals, which is found to be triggered by the structural transition.
The linear MR and related discussion indicate the possible existence of
Dirac-cone-like state, which may come from the band shift induced by
ferro-orbital order. The mobility of the Dirac-cone-like band is found to
decrease after S doping. Besides, the invalid Kohler's scaling of MR is found
for temperature below $T_s$ in both crystals, however the re-establishment of
the Kohler's scaling at temperatures below 30 K is observed in FeSe, but not in
FeSe$_{0.86}$S$_{0.14}$. All these observations above support that the orbital
ordering causes the band reconstruction in FeSe, and also that the orbital
ordering in FeSe is suppressed by the chemical pressure from S doping.
