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We propose to study the open charm effects in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\eta}$, $J/\ensuremath{\psi}{\ensuremath{\pi}}^{0}$ and $\ensuremath{\phi}{\ensuremath{\eta}}_{c}$. We show that the exclusive cross section line shapes of these processes would be strongly affected by the open charm effects. Since the final state light meson productions are through soft gluon radiations, we assume a recognition …