A high stable 9.2W and 12.06 ns pulse-width acousto-optic Q- switch solid- state green laser was reported. Through theoretical analysis and experimental research , the resonator was designed and optimized in order to compress pulse-width. In experiment , the double acousto-optic Q- switch was employed with single Nd:YVO4 rod and LBO crystal was applied for frequency doubling. The resonator is the flat-concave type. Under the pumping current of 30A ,a maximum green power of 9.2W was generated at 40kHz repetition rate and 8.164 ns pulse-width.