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 _ { d } = 20 K and 120 K , respectively .
The core has a total mass of up to 1.5 \times 10 ^ { 3 } M _ { \odot } and bolometric luminosity of 2.3 \times 10 ^ { 4 } ~ { } L _ { \odot } .
Both the mass and luminosity are dominated by the cold component ( T _ { 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 \times 10 ^ { -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 .