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We review the progress on experimental studies of the non-$D\bar D$ decays ofthe $\psi(3770)$ resonance. With the world average of the observed crosssections for $D\bar D$ production measured at 3.773 GeV by the MARK-I, MARK-II,BES and CLEO Collaborations, combined together with the cross section for$\psi(3770)$ production at its peak as well as initial state radiativecorrection factor, we find that the non-$D\bar D$ branching fraction of$\psi(3770)$ decays is $B[\psi(3770)\to {\rm non}-D\bar D]=(19.8\pm 1.8 \pm5.6)%$, which is consistent within error with $B[\psi(3770)\to {\rm non}-D\barD]=(14.7\pm 3.2)%$ measured previously by the BES Collaboration. In addition, aglobal amplitude analysis of the cross sections for $e^+e^- \to {\rm LH}$ (LH=light hadron) measured by the CLEO Collaboration shows that the light hadronbranching fraction of $\psi(3770)$ decays can be as large as about 11%. Combingthe totally measured hadronic and electromegnatic transition rate together withthe light hadron branching fraction in the decays of $\psi(3770)$ yields thetotal non-$D\bar D$ branching fraction in the decays of $\psi(3770)$ to beabout 13%.

Review of Experimental Studies of $\psi(3770)$ non-$D\bar D$ Decays