  We report here our lattice simulation on the charmonium spectra in the
quenched approximation. Because the full adjustment on the nonperturbative
parameters such as $C_E$, $C_B$, $m_0a_s$ and $r_s$ needs many calculation
time, we only adjust two of them, $m_0a_s$ and $r_s$($\xi_3$ plays this role in
the paper) but with some rescale for mass splitting. After the rescale, we find
that our results are in agreement with the experiment ones.
