  In this work, we adopt the $^3P_0$ model to investigate the strong decays of
the low-lying doubly bottom baryons in the $j-j$ coupling scheme
systematically. In this scheme, we construct the formulism of $^3P_0$ model
under the spectator assumption, and then the heavy diquark symmetry is
preserved automatically. Our results show that some of the $\lambda$-mode
$\Xi_{bb}(1P)$ and $\Omega_{bb}(1P)$ states are narrow, which have good
potentials to be observed by future experiments. For the low-lying $\rho$-mode
and $\rho$-$\lambda$ hybrid states, the Okubo-Zweig-Iizuka-allowed strong
decays are highly suppressed and they should be extremely narrow. Future
experiments can test our phenomenological predictions at the quark level.
