  Possible $H$-like dibaryon states $\Lambda_{c}\Lambda_{c}$ and
$\Lambda_{b}\Lambda_{b}$ are investigated within the framework of quark
delocalization color screening model. The results show that the interaction
between two $\Lambda_{c}$'s is repulsive, so it cannot be bound state by
itself. However, the strong attraction in $\Sigma_{c}\Sigma_{c}$ and
$\Sigma^{*}_{c}\Sigma^{*}_{c}$ channels and the strong channel coupling, due to
the central interaction of one-gluon-exchange and one-pion-exchange, among
$\Lambda_{c}\Lambda_{c}$, $\Sigma_{c}\Sigma_{c}$ and
$\Sigma^{*}_{c}\Sigma^{*}_{c}$ push the energy of system below the threshold of
$\Lambda_{c}\Lambda_{c}$ by $22$ MeV. The corresponding system
$\Lambda_{b}\Lambda_{b}$ has the similar properties as that of
$\Lambda_{c}\Lambda_{c}$ system, and a bound state is also possible in
$\Lambda_{b}\Lambda_{b}$ system.
