An acousto optic Q switched diode pumped Nd∶YVO 4 laser at 1064 nm is reported here. When the repetition rate is 70 kHz, the maximum average output power of 6.45 W is obtained with an optical conversion efficiency of 34.9% and a slope efficiency of 37.3%. And the shortest pulse width of 7.9 ns is also obtained at the same repetition. The highest single pulse energy of 213 μJ with peak power of 11.8 kW is generated at 10 kHz repetition rate.