Using $e^+e^-$ annihilation data taken at the CESR collider with the CLEO-c detector, measurements of two main $Omega^-$ branching fractions have been made using the reaction $psi(2S)toOmega^-overline{Omega}^+$, hyperon pair production at $sqrt{s}=3.69$~GeV, the peak of the $psi(2S)$ resonance. $Omega^-$ decay channels are identified through momentum distributions of charged particles, and systematics of the $Omega^-$ branching fractions have been studied. The result gives: $mathcal{B}(Omega^- to Lambda^0 K^-) = (68.9pm9.5pm4.3)%$, and $ mathcal{B}(Omega^- to Xi^0 pi^-) = (19.0pm4.0pm1.2)%$.
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