Electrostatic　spinning　is　one　of　the　main　methods　of　producing　nanofiber,　the　structure　of　the　nozzle　and　assembly　decides　the　spinning　quality　and　production,　and　the　reasonable　design　of　size　can　effectively　improve　the　spinning　efficiency.　The　selection　research　on　ten-needle　inline　nozzle　is　performed　by　using　numerical　simulation　method.　Combing　the　actual　requirement　of　engineering,　total　180　orthonormal　models　including　six　groups　of　needle　diameters,　six　groups　of　needle　lengths　and　five　groups　of　inlet　flux　are　calculated.　Then　the　partial　flow　and　drift　rate　in　nozzle　structure　are　obtained　under　the　conditions　of　different　inlet　flow,　different　needle　diameters　and　different　needle　lengths.　The　influence　of　nozzle　diameter　and　length　on　exit　drift　rate　is　analyzed,　and　according　to　different　working　conditions,　the　reasonable　size　selection　scheme　of　nozzle　structure　is　given.　©　2016　Journal　of　Mechanical　Engineering.