  Possible effects of the color screened confinement potential are
investigated. Color screened linear potential with a large string tension
$T=(0.26-0.32)GeV^2$ is suggested by a study of the $c\bar c$ and $b\bar b$
spectra. The $\psi (4160)$ and $\psi (4415)$ are respectively assigned as the
$\psi (4S)$-dominated and the $\psi (5S)$ $c\bar c$ states. Satisfactory
results for the masses and leptonic widths (with QCD radiative corrections) of
$c\bar c$ and $b\bar b$ states are obtained.
