  The Chinese satellite Wukong, also known as the DArk Matter Particle Explorer
(DAMPE), has released its observation data of the cosmic ray (CR) electrons and
positrons. The data shows an excess in the energy spectrum up to TeV energy,
and possibly a peak-like fine structure at $\sim 1.4 \TeV$. We investigate the
scenario that the source of the excess comes from dark matter annihilation or
decay. We find that the annihilation or decay of diffuse dark matter particles
in the Galactic halo can give excellent ($W^+W^-$ channel) or at least good
(double $\tau^+\tau^-$ channel) fits to the broad excess. However, the
annihilation cross-section is $10^{-23}\cm^3s^{-1}$, larger than required for
getting the correct relic abundance. We then study whether the narrow peak at
$\sim 1.4\TeV$ could be explained by a nearby subhalo, which thanks to the
smaller distance, could supply $e^+e^-$ within a narrow energy range. We find
that in order to produce a peak width less than the energy bin width (0.2 TeV),
the source must be located within $r\lsim 0.53~\kpc$. Our global fit models do
not produce the peak-like feature, instead at 1.4 TeV the spectrum show either
a slope or a cliff-like feature. However, if less than optimal fit is allowed,
the peak-like feature could be generated. Furthermore, an excellent fit with
peak could be obtained with model B if the background is rescaled. If the dark
matter decay and annihilation rates are determined using the broad excess, the
required subhalo mass $\sim10^{5}~M_\odot$ for decay model, or
$\sim10^{4.5}\Msun$ for annihilation model and a shallower density profile
slope $\alpha=1.2$, or $\sim10^{2.5}\Msun$ for the steep density profile
$\alpha=1.7$. However, the probability for the existence of a such nearby
subhalo as massive as given above is very low.
