  In the manuscript, central black hole (BH) mass is estimated in the distant
TDE (tidal disruption event) of {\it Swift} J2058.4+0516 as the second
candidate of relativistic jet birth related to TDE. {\it Swift} J2058.4+0516
have quite different BH masses estimated through different indirect methods in
the literature. Therefore, it is necessary and interesting to determine the
central BH mass in {\it Swift} J2058.4+0516 by one another independent method.
Here, based on the theoretical TDE model applied to describe the long-term
time-dependent X-ray variabilities of {\it Swift} J2058.4+0516, the central BH
mass can be well determined to be around $1.05_{-0.29}^{+0.39}\times10^5{\rm
M_\odot}$, after kind considerations of suggested intrinsic beaming effects
from such relativistic jet tightly related to TDE. Moreover, the {\it Swift}
J2058.4+0516 is an unique object in the space of BH masses versus energy
transfer efficiencies of the reported TDE candidates, providing interesting
clues to detect and/or anticipate candidates of relativistic TDE to make the
birth of relativistic jets.
