\begin{document}$ 1.89 \times 10^8 J/\psi \rightarrow \Lambda \bar{\Lambda} $\end{document} Monte Carlo (MC) events produced from a longitudinally-polarized electron beam, the sensitivity of the \begin{document}$ CP $\end{document} violation of Λ decay is studied using fast simulation software. In addition, the \begin{document}$ J/\psi \rightarrow \Lambda \bar{\Lambda} $\end{document} decay can be used to optimize the detector response using the interface provided by the fast simulation software. In the future, the STCF is expected to obtain 3.4 trillion \begin{document}$ J/\psi $\end{document} events, and the statistical sensitivity of the \begin{document}$ CP $\end{document} violation of Λ decay via the \begin{document}$ J/\psi \rightarrow \Lambda \bar{\Lambda} $\end{document} process is expected to reach \begin{document}$ \mathcal O (10^{-5}) $\end{document} when the electron beam polarization is 80%."> Prospects of <i>CP</i> violation in Λ decay with a polarized electron beam at the STCF -
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