  In this manuscript, strong clues are reported to support the normal broad
line AGN SDSS J1617+0638 as the host galaxy harboring a central tidal
disruption event (TDE). Through the optical flare in the CSS 8.5years-long
light curve and the none-variability in the up-to-date ASAS-SN light curves,
the theoretical TDE model described by the MOSFIT code can be applied in SDSS
J1617+0638. Meanwhile, considering the assumed central TDE expected continuum
emissions not strong enough to describe the continuum emissions in the SDSS
spectrum of SDSS J1617+0638, an additional power law component from
pre-existing AGN activity should be necessary in SDSS J1617+0638. Furthermore,
considering the short time duration to the observed date for the SDSS spectrum
from the starting time of the assumed central TDE in SDSS J1617+0638, TDE model
expected accreting mass only about 0.03$M_\odot$ can lead to few effects of
TDEs debris on the observed broad emission lines in the SDSS spectrum of SDSS
J1617+0638, indicating the TDE model determined BH mass simply consistent with
the virial BH mass by broad emission lines, as determined results in SDSS
J1617+0638. Therefore, through both the photometric variability and the
spectroscopic results, a central TDE can be preferred in the normal broad line
AGN SDSS J1617+0638 with pre-existing central AGN activity and pre-existing
broad emission line regions.
