  In this letter, we present a spectacular eruptive flare (X8.2) associated
with a coronal mass ejection (CME) on 2017 September 10 at the west limb of the
Sun. A flux rope eruption is followed by the inflow, the formation of a current
sheet and a cusp structure, which were simultaneously observed during the
occurrence of this flare. The hierarchical layers of the cusp-shaped structure
are well observed in 131 \AA\ observation. The scenario that can be created
from these observations is very consistent with the predictions of some
eruptive models. Except for the characteristics mentioned above in the process
of the flare predicted by classical eruption models, the current sheet
separating into several small current sheets is also observed at the final
stage of the flux rope eruption. The quantitative calculation of the velocities
and accelerations of the inflow, hot cusp structure, and post-flare loops is
presented. The width of the current sheet is estimated to be about 3 $\times$
$10^{3}$ km. These observations are very useful to understand the process of
solar eruptions.
