  We analyzed the process of $B_s\rightarrow \rho \rho$ decay in QCD
factorization (QCDF) and final state interaction (FSI) effects. In QCDF for
this decay we have only the annihilation graph and we expected small Branching
ratio. Then we considered FSI effect as a sizable correction where the
intermediate states are $\pi^0\pi^0$, $\pi^+\pi^-$, $K^0\bar{K^0}$ and $K^+K^-$
mesons. To consider the amplitudes of these intermediate states, QCDF approach
was used. The experimental branching ratio of $B_s\rightarrow \rho\rho$ is less
than $3.20\times 10^{-4}$ and our result is $1.08 \times 10^{-9}$ and $3.29
\times10^{-4}$ from QCDF and FSI, respectively.
