  In the framework of $RGM$, the binding energy of the six quark system with
strangeness s=-5 is systematically investigated under the SU(3) chiral
constituent quark model. The single $\Xi^*\Omega$ channel calculation with
spins S=0 and 3 and the coupled $\Xi\Omega$ and $\Xi^*\Omega$ channel
calculation with spins S=1 and 2 are considered, respectively. The results show
following observations: In the spin=0 case, $\Xi^* \Omega$ is a bound dibaryon
with the binding energy being $80.0 \sim 92.4 MeV$. In the S=1 case,
$\Xi\Omega$ is also a bound dibaryon. Its binding energy is ranged from $26.2
MeV$ to $32.9 MeV$. In the S=2 and S=3 cases, no evidence of bound dibaryons
are found. The phase shifts and scattering lengths in the S=0 and S=1 cases are
also given.
