  Recently, DAMPE has released its first results on the high-energy cosmic-ray
electrons and positrons (CREs) from about $25$ GeV to $4.6$ TeV, which directly
detect a break at $\sim 1$ TeV. This result gives us an excellent opportunity
to study the source of the CREs excess. In this work, we used the data fo
proton and helium flux (from AMS-02 and CREAM), $\bar{\mathrm{p}}/\mathrm{p}$
ratio (from AMS-02), positron flux (from AMS-02) and CREs flux (from DAMPE
without the peak signal point at $\sim 1.4$ TeV) to do global fitting
simultaneously, which can account the influence from the propagation model, the
nuclei and electron primary source injection and the secondary lepton
production precisely. For extra source to interpret the excess in lepton
spectrum, we consider two separate scenarios (pulsar and dark matter
annihilation via leptonic channels) to construct the bump ($\gtrsim 100$ GeV)
and the break at $\sim 1$ TeV. The result shows: (i) in pulsar scenario, the
spectral index of the injection should be $\nu_{\mathrm{psr}} \sim 0.65$ and
the cut-off should be $R_{c} \sim 650$ GV; (ii) in dark matter scenario, the
dark matter particle's mass is $m_{\chi} \sim 1208$ GeV and the cross section
is $\langle \sigma v \rangle \sim 1.48 \times 10^{-23} \mathrm{cm}^{3}
\mathrm{s}^{-1}$. Moreover, in the dark matter scenario, the $\tau \bar{\tau}$
annihilation channel is highly suppressed, and a DM model is built to satisfy
the fitting results.
