  The most strange dibaryon $\Omega\Omega$ with quantum numbers $S=-6$, $I=0$,
and $J^{P}=0^{+},~1^{-},~2^{+},~3^{-}$ is reanalyzed in the framework of quark
delocalization color screening model (QDCSM) and chiral quark model (ChQM). The
$\Omega\Omega$ dibaryon with $J^{P}=0^{+}$ is bound, and the one with other
quantum numbers $J^{P}=1^{-},~2^{+},~3^{-}$ are all unbound in our calculation.
The low-energy scattering phase shifts, the scattering length, and the
effective range of the $\Omega\Omega$ dibaryon with $J^{P}=0^{+}$ also support
the existence of such strange dibaryon. This dibaryon is showed to be a shallow
bound state in QDCSM, while the binding energy becomes much larger in the ChQM
by including the effect of the hidden-color channel coupling. And the scalar
nonet meson-exchange in the ChQM also provides more attraction for the
$\Omega\Omega$ system. Experimental search for such most strange dibaryon will
provide much information for understanding the hadron-hadron interactions in
different quark models.
