  Kaon photo-production process on $^{12}$C has been studied by measuring
neutral kaons in a photon energy range of 0.8$-$1.1 GeV. Neutral kaons were
identified by the invariant mass constructed from two charged pions emitted in
the $K^{0}_{S}\to\pi^{+}\pi^{-}$ decay channel. The differential cross sections
as well as the integrated ones in the threshold photon energy region were
obtained. The obtained momentum spectra were compared with a Spectator model
calculation using elementary amplitudes of kaon photo-production given by
recent isobar models. Present result provides, for the first time, the
information on $n(\gamma,K^{0})\Lambda$ reaction which is expected to play an
important role to construct models for strangeness production by the
electromagnetic interaction. Experimental results show that cross section of
$^{12}{\rm C}(\gamma,K^0)$ is of the same order to that of $^{12}{\rm
C}(\gamma,K^+)$ and suggest that slightly backward $K^0$ angular distribution
is favored in the $\gamma n\to K^0\Lambda$ process.
