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The $B_{u}$ ${\to}$ ${\psi}M$ decays are studied with the perturbative QCDapproach, where the psion ${\psi}$ $=$ ${\psi}(2S)$, ${\psi}(3770)$,${\psi}(4040)$ and ${\psi}(4160)$, and the light meson $M$ $=$ ${\pi}$, $K$,${\rho}$ and $K^{\ast}$. The factorizable and nonfactorizable contributions,and the $S$-$D$ wave mixing effects on the psions are considered in thecalculation. With appropriate inputs, the branching ratios for the $B_{u}$${\to}$ ${\psi}K$ decays are generally coincident with the experimental datawithin errors. However, due to the large theoretical and experimental errors,it is impossible for the moment to give a severe constraint on the $S$-$D$ wavemixing angles.

$B_{u}$ ${\to}$ ${\psi}M$ decays and $S$-$D$ wave mixing effects