  The first source catalog of Large High Altitude Air Shower Observatory
reported the detection of a very-high-energy gamma ray source, 1LHAASO
J1219+2915. In this paper a further detailed study of the spectral and temporal
behavior of this point-like source have been carried. The best-fit position of
the TeV source ($\rm{RA}=185.05^{\circ}\pm0.04^{\circ}$,
$\rm{Dec}=29.25^{\circ}\pm0.03^{\circ}$) is compatible with NGC 4278 within
$\sim0.03$ degree. Variation analysis shows an indication of the variability at
a few months level in the TeV band, which is consistent with low frequency
observations. Based on these observations, we report the detection of TeV
$\gamma$-ray emissions from this low-luminosity AGN NGC 4278. The observations
by LHAASO-WCDA during active period has a significance level of 8.8\,$\sigma$
with best-fit photon spectral index $\varGamma=2.56\pm0.14$ and a flux
$f_{1-10\,\rm{TeV}}=(7.0\pm1.1_{\rm{sta}}\pm0.35_{\rm{syst}})\times10^{-13}\,\rm{photons\,cm^{-2}\,s^{-1}}$,
or approximately $5\%$ of the Crab Nebula. The discovery of VHE from NGC 4278
indicates that the compact, weak radio jet can efficiently accelerate particles
and emit TeV photons.
