  We present a multi-wavelength observational study towards the high-mass young
stellar object G8.68-0.37. A single massive gas-and-dust core is observed in
the (sub)millimeter continuum and molecular line emissions. We fitted the
spectral energy distribution (SED) from the dust continuum emission. The
best-fit SED suggests the presence of two components with temperature of
$T_{\rm d}=20$ K and 120 K, respectively. The core has a total mass of up to
$1.5\times10^3$ $M_{\odot}$ and bolometric luminosity of $2.3\times10^4
L_{\odot}$. Both the mass and luminosity are dominated by the cold component
($T_{\rm d}=20$ K). The molecular lines of C$^{18}$O, C$^{34}$S, DCN, and
thermally excited CH$_3$OH are detected in this core. Prominent infall
signatures are observed in the $^{12}$CO $(1-0)$ and $(2-1)$. We estimated an
infall velocity of 0.45 km s$^{-1}$ and mass infall rate of $7\times10^{-4}
M_{\odot}$ year$^{-1}$. From the molecular lines, we have found a high DCN
abundance and relative abundance ratio to HCN. The overabundant DCN may
originate from a significant deuteration in the previous cold pre-protostellar
phase. And the DCN should now be rapidly sublimated from the grain mantles to
maintain the overabundance in the gas phase.
