  Since April 28, 2020, Insight-HXMT has implemented a dedicated observation on
the magnetar SGR J1935+2154. Thanks to the wide energy band (1-250 keV) and
high sensitivity of Insight-HXMT, we obtained 75 bursts from SGR J1935+2154
during a month-long activity episode after the emission of FRB 200428. Here, we
report the detailed time-integrated spectral analysis of these bursts and the
statistical distribution of the spectral parameters. We find that for
15%(11/75) of SGR J1935+2154 bursts, the CPL model is preferred, and most of
them occurred in the latter part of this active epoch. In the cumulative
fluence distribution, we find that the fluence of bursts in our sample is about
an order of magnitude weaker than that of Fermi/GBM, but follows the same power
law distribution. Finally, we find a burst with similar peak energy to the
time-integrated spectrum of the X-ray burst associated with FRB 200428 (FRB
200428-Associated Burst), but the low energy index is harder.
