A　compact　fiber-coupled　diode-pumped　electro-optically　Q-switched　Nd:　YVO4　laser　is　reported.　Through　theoretical　analysis　and　experimental　research,　we　determine　the　Nd:　YVO4　laser　structure　and　its　parameters.　Both　theoretical　analysis　and　experiment　data　demonstrate　that　subnanosecond　pulses　can　be　produced　with　electro-optically　Q-switched　technique.　The　cavity　length　is　effectively　reduced　to　20　mm　to　narrow　the　pulse　width.　Stable　pulses　are　obtained　at　1-100　Hz,　the　pulse　width　is　narrower　than　600　ps　and　the　single　pulse　energy　is　more　than　0.42　mJ,　M2　is　1.7　and　the　stability　is　±3%.