Based　on　mechanical　vibration　and　modal　analysis　theory,　and　LabVIEW　software　as　a　development　platform,　this　paper　develops　a　dynamic　characteristic　test　system,　which　quickly　and　accurately　measures　a　multi-DOF　system＇s　first-order　natural　frequency　and　formation　through　sweep　frequency.　Experiments　show　that　the　system　can　obtain　accurate　and　reliable　data,　and　has　a　highly　practical　value.