  The identification of deuteron with momentum in range of $0.52$-$0.72$
GeV/$c$ has been studied with the specific ionization energy loss information,
using the data sample collected by the BESIII detector at center-of-mass
energies between $4.009$ and $4.946$ GeV. Clean deuteron samples are selected
using time of flight information. For all data samples, the deuteron
identification efficiencies are higher than $95\%$, with a maximum difference
of $(4.93\pm0.95)\%$ between data and MC simulation. These verify the
effectiveness of the deuteron identification method based on the specific
ionization energy loss, and provide valuable information for the future studies
of the processes involving deuteron in the final state at BESIII.
