  In the two-quark model supposition for the meson $a_0(1450)$, which can be
viewed as either the first excited state (scenario I) or the lowest lying state
(scenario II), the branching ratios and the direct CP-violating asymmetries for
decays $B^-\to a^{0}_0(1450)K^{*-}, a^{-}_0(1450)K^{*0}$ and $\bar B^0\to
a^{+}_0(1450)K^{*-}, a^{0}_0(1450)\bar K^{*0}$ are studied by employing the
perturbative QCD factorization approach. We find the following results: (a) For
the decays $B^-\to a^{-}_0(1450)K^{*0}, \bar B^0\to a^{+}_0(1450)K^{*-},
a^{0}_0(1450)\bar K^{*0}$, their branching ratios in scenario II are larger
than those in scenario I about one order. So it is easy for the experiments to
differentiate between the scenario I and II for the meson $a_0(1450)$. (b)For
the decay $B^-\to a^{0}_0(1450)K^{*-}$, due to not receiving the enhancement
from the $K^*-$emission factorizable diagrams, its penguin operator
contributions are the smallest in scenario II, which makes its branching ratio
drop into the order of $10^{-6}$. Even so, its branching ratio in scenario II
is still larger than that in scenario I about 2.5 times. (c) Even though our
predictions are much larger than those from the QCD factorization results, they
are still consistent with each other within the large theoretical errors from
the annihilation diagrams. (d) We predict the direct CP- violating asymmetry of
the decay $B^-\to a^{-}_0(1450)K^{*0}$ is small and only a few percent.
