  Through analyzing the $B_{(s)}$ charmed decays $B^{0}\to \bar D_{0}f_0(980)$
and $B_{s}\to \bar D_{0}f_0(980)$ within the framework of the PQCD
factorization approach and comparing with the current data, we find that there
are two possible regions for the $f_0(980)-f_0(500)$ mixing angle $\theta$: one
is centered at $34^\circ\sim38^\circ$ and the other is falls into
$142^\circ\sim154^\circ$. The former can overlap mostly with one of allowed
angle regions extracted from the decay $B^{0}\to \bar D_{0}f_0(500)$. The
branching fractions of $B_s$ decay modes are less sensitive to the mixing angle
compared with those of B decay modes. Especially, for the decay $B_{s}\to D^0
f_0(980)$, its branching fraction changes only slightly between
$(1.2\sim1.8)\times10^{-7}$ when the mixing angle $\theta$ runs from $0^\circ$
to $180^\circ$. All of our results support the picture that the $f_0(980)$ is
dominated by two quark component in the B decay dynamic mechanism. Furthermore,
the $s\bar s$ component is more important than the $q\bar q=(u\bar u+d\bar
d)/\sqrt{2}$ component. This point is different from $f_0(500)/\sigma$. Last
but not least, our picture is not in conflict with the popular four-quark
explanation.
