  We recalculate the branching ratio and CP asymmetry for $\bar{B}^{0}
(B^{0})\to \pi^{0}\pi^{0}$ decays in the Perturbative QCD approach. In this
approach, we consider all the possible diagrams including non-factorizable
contributions and annihilation contributions. We obtain $Br(\bar{B}^{0}
(B^{0})\to \pi^{0}\pi^{0})=(1.17_{-0.12}^{+0.11})\times 10^{-6}$. Our result is
in agreement with the latest measured branching ratio of
$B^{0}\to\pi^{0}\pi^{0}$ by the Belle and HFAG Collaborations. We also predict
large direct CP asymmetry and mixing CP asymmetry in $B^{0}\to\pi^{0}\pi^{0}$
decays, which can be tested by the coming Belle-II experiments.
