This　paper　introduces　a　novel　kind　of　E-O　Q-switched　Nd:YVO4　compact　laser　with　ultra-narrow　pulse　width.　In　this　paper,　the　general　equations　describing　Q-switched　laser　operation　are　given　and　the　factors　about　cavity　length,　laser　gain　medium,　the　loss　inner　resonator　and　pump　energy　to　influence　the　laser　pulse　width　are　analyzed　theoretically.　These　parameters　greatly　optimized　experiment.　The　fiber-coupled　laser-diode　end-pumped　laser　we　developed　simplifies　the　conventional　structure　of　E-O　Q-switched　lasers.　The　cavity　length　is　effectively　reduced　to　19mm　to　narrow　the　pulse　width.　The　pulse　width　of　1.049ns　is　obtained　and　the　single　pulse　energy　reaches　to　0.32mJ.　This　1　nanosecond　laser　has　the　advantage　in　reliable　and　outstanding　performance　with　simplified　structure.　Most　importantly,　we　investigated　the　performance　of　an　innovative　RTP　crystal　in　the　Q-switched　laser　with　high　repetition　frequency.　It　was　experimentally　proven　that　this　narrow　pulse　width　laser　can　operate　with　high　repetition　frequency　because　of　the　novel　Q-switched　crystal　RTP　with　great　performance.　Both　theoretical　analysis　and　experiment　data　demonstrate　that　sub-nanosecond　pulses　can　also　be　produced　with　E-O　Q-switching　technique.　Thus,　this　technique　can　be　widely　applied.