In this paper, we investigate $��^- \to e^-(��^-) K\bar{K}(K\bar{K}=K ^+K^-,K^0\bar{K}^0)$ decays in the framework of the RPV SUSY model. We discuss the tree level contribution of the sparticles $\tilde��$ and $\tilde{u}$ to these decay branching ratios. In the two channels, the $\tilde��$-mediated channel is more sensitive to the parameter product $|��^{'*}_{i22}��_{i31(2)}|$ than the $\tilde{u}$-mediated channel to $|��^{'*}_{1(2)j2}��'_{3j2}|$. And the parameter product $|��^{'*}_{i22}��_{i31(2)}|$ is severely constrained to the order of ${\cal O}(10^{-5})$ by the experiment data with $m_{\tilde��}=100 GeV$, which is one order of magnitude more stringent than before. In the calculation of hadronic matrix elements, the resonant effects are large than those of non-resonant terms. Especially, the resonant contribution of scalar meson $f_{(980)}$ plays a dominate role in $\tilde��$-mediated channel.
8 pages, 3 figures, 1 Table. Add the discussion of squarks' contribution