For　the　shortcomings　of　current　schemes　to　generate　laser　supercontinuum　spectra,　an　acousto-optic　Q-switched　nanosecond　all　fiber　laser　is　established.　The　laser　shows　its　central　wavelength　at　1064.3　nm,　repetition　rate　of　20　kHz　and　a　pulse　duration　of　250　ns.　After　primary　amplification,　the　output　power　is　13.02　W.　When　the　amplified　pulse　is　launched　into　a　self-made　high　power　Mode　Field　Adaptor　(MFA),　the　signal　light　output　can　be　10.7　W　and　the　coupling　efficiency　is　up　to　82.2%.　After　the　MFA　is　spliced　with　a　piece　of　Photonic　Crystal　Fiber　(PCF),　the　output　supercontinuum　spectrum　with　an　average　output　power　of　5.43　W　can　be　obtained　at　a　wavelength　range　from　900　nm　to　1700　nm.　As　the　Acoustic　Optical　Modulator　(AOM)　in　the　experiment　has　a　wider　pulse　duration,　which　leads　to　a　lower　peak　value　of　pump　light　and　a　lower　nonlinear　effect,　so　that　the　supercontinuum　spectra　do　not　include　the　visual　part.　It　suggests　that　the　AOM　with　narrower　pulse　duration　should　be　used　to　generate　high　peak　power　to　widen　the　spectral　bandwidth　and　flatten　the　supercontinuum　spectra.