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CP Conserving and Violating Contributions to $K_L\toπ^+π^-ν\barν$

We study both CP conserving and violating contributions to the decay $K_L\toπ^+π^-ν\barν$. We find that the decay branching ratio is dominated by the CP conserving part. In the standard CKM model, we estimate that for $m_t\sim 174\ GeV$, the branching ratio due to the CP conserving (violating) contributions can be as large as $4.4 \times 10^{-13}$ ($1.0\times 10^{-14}$).