  We report the reconstruction method of the fast fission events in 25 MeV/u
$^{86}$Kr +$^{208}$Pb reactions at the Compact Spectrometer for Heavy IoN
Experiment (CSHINE). The fission fragments are measured by three large-area
parallel plate avalanche counters, which can deliver the position and the
arrival timing information of the fragments. The start timing information is
given by the radio frequency of the cyclotron. Using the velocities of the two
fission fragments, the fission events are reconstructed. The broadening of both
the velocity distribution and the azimuthal difference of the fission fragments
decrease with the folding angle, in accordance with the picture that fast
fission occurs. The anisotropic angular distribution of the fission axis also
reveals consistently the dynamic feature the fission events.
