  We report the magnetoresistance, Hall effect, de Haas-van Alphen (dHvA)
oscillations and the electronic structures of single crystal RhSn, which is a
typical material of CoSi family holding a large Chern number. The large
unsaturated magnetoresistance is observed with B//[001]. The Hall resistivity
curve indicates that RhSn is a multi-band system with high mobility. Evident
quantum oscillations have been observed, from which the light effective masses
are extracted. Ten fundamental frequencies are extracted after the fast Fourier
transform analysis of the dHvA oscillations with B//[001] configuration. The
two low frequencies F$_1$ and F$_2$ do not change obviously and the two high
frequencies F$_9$ and F$_{10}$ evolve into four when B rotates from B//[001] to
B//[110], which is consistent with the band structure in the first-principles
calculations with spin-orbit coupling (SOC). The extracted Berry phases of the
relative pockets show a good agreement with the Chern number $\pm4$ (with SOC)
in the first-principles calculations. Above all, our studies indicate that RhSn
is an ideal platform to study the unconventional chiral fermions and the
surface states.
