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We present an electro-optically Q-switched 2.79 μm Cr, Er: Y2.9aSc1.43 Ga3.64 O12 laser using LiNbOa Pockels cell and undoped Y3Al15O12 plate polarizer. The optimal delay for triggering the Q-switch with respect to the peak of waveform of the flashlamp is found to be about 120 μs. The minimum pump threshold of 13.2 J is realized using the output coupler of reflectivity 74%. The maximum outputs of 72.3mJ at 3 Hz and 35.4mJ at 10 Hz repetition rates are obtained. The minimum pulse width is measured to be 31.9 ns. The far-field divergence angle of the laser beam is about 8.8mrad. The influence of repetition rates on the output energy is also discussed.